A tractor’s fuel use per hour comes down to two things: how much power it has, and how much of that power the job uses. A budgeting rule from Iowa State University puts average diesel use at 0.044 gal/h for each horsepower of maximum PTO power. On that rule, a 100 PTO hp (75 kW) tractor averages about 4.4 gal/h (17 L/h) over a year. Under a steady load, the ASABE fuel equation puts the same tractor at about 3.0 gal/h (11 L/h) at quarter load and 6.2 gal/h (24 L/h) at full load.
Estimated tractor fuel consumption per hour by horsepower and load
The table below is calculated, not measured. It uses the general fuel equation for diesel tractors in ASAE D497.6 (2009), Agricultural Machinery Management Data, as reproduced in Virginia Tech publication 442-073:
Fuel use (gal/h) = (0.0434 × X + 0.019) × rated PTO hp
X is the load: the share of rated PTO power the job uses, as a decimal. The equation assumes full throttle. All figures are estimated gal/h, with L/h in brackets (3.785 L per US gallon). The last column is Iowa State’s year-round average rule, 0.044 × PTO hp.
| Rated PTO power | 25% load | 50% load | 75% load | Full load | Year-round average (0.044 rule) |
|---|---|---|---|---|---|
| 50 hp (37 kW) | 1.5 (5.6) | 2.0 (7.7) | 2.6 (9.8) | 3.1 (12) | 2.2 (8.3) |
| 75 hp (56 kW) | 2.2 (8.5) | 3.1 (12) | 3.9 (15) | 4.7 (18) | 3.3 (12) |
| 100 hp (75 kW) | 3.0 (11) | 4.1 (15) | 5.2 (20) | 6.2 (24) | 4.4 (17) |
| 150 hp (112 kW) | 4.5 (17) | 6.1 (23) | 7.7 (29) | 9.4 (35) | 6.6 (25) |
| 200 hp (149 kW) | 6.0 (23) | 8.1 (31) | 10.3 (39) | 12.5 (47) | 8.8 (33) |
| 250 hp (186 kW) | 7.5 (28) | 10.2 (39) | 12.9 (49) | 15.6 (59) | 11.0 (42) |
| 300 hp (224 kW) | 9.0 (34) | 12.2 (46) | 15.5 (59) | 18.7 (71) | 13.2 (50) |
| 400 hp (298 kW) | 11.9 (45) | 16.3 (62) | 20.6 (78) | 25.0 (94) | 17.6 (67) |
Fuel per hour does not fall in step with load. At full throttle and no load, the equation still burns 0.019 gal/h per rated hp, about 1.9 gal/h for a 100 hp tractor. The Nebraska test of a 116 PTO hp John Deere 7610 measured 2.05 gal/h at high idle with almost no load. So a 100 hp tractor at half load uses about 30% more fuel per horsepower-hour of work than at full load. The 0.044 rule matches the load equation at about 58% load: it is a year-round budget figure, not a figure for any one job.
To run the numbers for your own tractor, hours and diesel price, use our tractor fuel consumption calculator.
What Nebraska tests measured
In publication 442-450 (2011), Virginia Tech summarized Nebraska Tractor Test Laboratory results for more than 700 diesel tractors tested over the previous two decades or so. The table shows average measured fuel use at maximum drawbar power, at 50% of that pull at full throttle, and at the same 50% pull in a faster gear at reduced engine speed.
| Tractor group (PTO hp range) | Average PTO power | Maximum power | 50% pull, full throttle | 50% pull, reduced engine speed | Fuel cut from gearing up | Tractors averaged |
|---|---|---|---|---|---|---|
| MFWD, 40–80 hp | 62.0 hp (46 kW) | 3.9 (15) | 2.8 (11) | 2.3 (9) | 16.0% | 80 |
| MFWD, 80–120 hp | 99.2 hp (74 kW) | 6.2 (23) | 4.3 (16) | 3.6 (14) | 16.4% | 149 |
| MFWD, 120–160 hp | 141.0 hp (105 kW) | 8.7 (33) | 5.9 (22) | 4.9 (19) | 16.7% | 116 |
| MFWD, over 160 hp | 199.2 hp (149 kW) | 11.9 (45) | 8.0 (30) | 6.6 (25) | 16.4% | 128 |
| 4WD and tracks, 200–240 hp | 218.1 hp (163 kW) | 13.0 (49) | 8.9 (34) | 7.3 (28) | 17.0% | 34 |
| 4WD and tracks, 240–280 hp | 259.8 hp (194 kW) | 15.4 (58) | 10.7 (41) | 8.6 (33) | 19.0% | 30 |
| 4WD and tracks, over 280 hp | 357.5 hp (267 kW) | 20.8 (79) | 14.2 (54) | 11.9 (45) | 16.1% | 86 |
Fuel columns are measured gal/h, with L/h in brackets; MFWD means front-wheel drive engaged. The 80–120 hp group’s 6.2 gal/h at maximum power sits right on the estimate for a 100 hp tractor at full load. The two 50% pull columns are the same work done two ways: shifting up and throttling back cut fuel by roughly 16–19%, as reported by Virginia Tech.
100 hp tractor fuel consumption
For a 100 PTO hp (75 kW) tractor, the estimate runs from about 3.0 gal/h (11 L/h) at quarter load to 6.2 gal/h (24 L/h) at full load, with a year-round average of 4.4 gal/h (17 L/h). Nebraska-tested MFWD tractors of 80–120 PTO hp measured 6.2 gal/h at maximum drawbar power, 4.3 gal/h at half pull and 3.6 gal/h at half pull after gearing up and throttling down.
John Deere tractor fuel consumption per hour
John Deere tractors go through Nebraska tests like every other brand. Two older Deere reports, reproduced by Virginia Tech, show how the figures read. Where a line gives only hp-hr/gal, fuel per hour is the horsepower divided by that figure.
| Tractor and test | Test condition | Power | hp-hr/gal | Fuel use |
|---|---|---|---|---|
| John Deere 7610, Nebraska OECD Test 1725 | PTO, rated engine speed (2,100 rpm) | 115.96 PTO hp (86 kW) | 17.00 | 6.82 gal/h (26 L/h), as reported |
| John Deere 7610 | PTO, maximum power (1,801 rpm) | 117.27 PTO hp (87 kW) | 18.00 | 6.51 gal/h (25 L/h), as reported |
| John Deere 7610 | Drawbar, 75% pull, full throttle | 75.72 drawbar hp | 12.80 | 5.9 gal/h (22 L/h), calculated |
| John Deere 7610 | Drawbar, 75% pull, reduced engine speed (1,665 rpm) | 75.86 drawbar hp | 14.63 | 5.2 gal/h (20 L/h), calculated |
| John Deere 8210, Nebraska Test 1773 | Drawbar, maximum power | 165 drawbar hp | 15.50 | 10.7 gal/h (40 L/h), as reported by Virginia Tech |
| John Deere 8210 | Drawbar, 50% pull, full throttle | 87.78 drawbar hp | 12.37 | 7.1 gal/h (27 L/h), calculated |
| John Deere 8210 | Drawbar, 50% pull, reduced engine speed | 87.62 drawbar hp | 14.74 | 5.9 gal/h (23 L/h), calculated |
These are older models. Current Deere tractors have their own reports, and they read the same way. To see which engine powers your machine, and how it is rated, see our pages on the John Deere 4045 engine and the John Deere 6068 engine.
How to read Nebraska test fuel data
The Nebraska Tractor Test Laboratory at the University of Nebraska–Lincoln is the officially designated tractor test station for the United States, and it tests to OECD codes. Its reports give fuel in three forms:
- gal/hr (L/h): fuel burned per hour at the test condition.
- hp-hr/gal (kW·h/L): work done per gallon, which Virginia Tech calls specific volumetric fuel efficiency. Higher is better, the same way miles per gallon works for a pickup. Virginia Tech puts diesel tractors at roughly 12–21 hp-hr/gal.
- lb/hp-hr (kg/kW·h): fuel by weight per unit of work. Lower is better.
To turn an efficiency figure into gallons per hour, divide horsepower by hp-hr/gal. For example, 75.72 hp ÷ 12.80 hp-hr/gal = 5.9 gal/h.
The PTO section
The PTO tests load the engine through the PTO shaft on a dynamometer. Start with the two headline lines: maximum power at rated engine speed, and maximum power overall, which on many tractors comes at a lower engine speed. Below them, a varying-power table repeats the test at roughly 100, 85, 65, 45, 20 and 0% of rated PTO power.
Read down that table and you see efficiency fall as load drops. On the John Deere 7610 it went from 17.00 hp-hr/gal at full rated power to 14.73 at about two-thirds load and 8.42 at about one-fifth.
The drawbar section
The drawbar tests measure pull, travel speed, wheel slip and fuel on a concrete test track. Five matter for fuel: (1) maximum drawbar power at full throttle; (2) 75% of that pull at full throttle; (3) 75% pull in a faster gear at reduced engine speed; (4) 50% pull at full throttle; (5) 50% pull in a faster gear at reduced engine speed.
Compare test 2 with test 3, and test 4 with test 5: pull and speed stay about the same, and only the gear and throttle change. Virginia Tech found most tractors burn 5–15% less fuel in test 3 than test 2, and 15–30% less in test 5 than test 4. Since most field work is at part load, these lines usually say more about day-to-day fuel use than the maximum-power line.
Compare like with like
PTO hp-hr/gal is higher than drawbar hp-hr/gal for the same tractor, because of transmission and traction losses. Virginia Tech gives about 13.5 hp-hr/gal as average for drawbar loads and 18.5 as very efficient for PTO work. Compare tractors on the same test line, because a tractor can lead one category and trail in another.
What changes a tractor’s fuel use per hour
Load and tractor size
Fuel follows the power the job takes, but a lightly loaded engine at full throttle wastes the most. In Virginia Tech’s tractor-sizing example, two tractors do the same 165 drawbar hp of work. A smaller MFWD tractor (a John Deere 8210) at full load burned 10.7 gal/h. A four-wheel drive about twice its size (a Case IH STX 375) at half load burned 12.8 gal/h at full throttle, but only 9.7 gal/h once geared up and throttled down.
Engine speed
Virginia Tech advises gear up, throttle down on jobs that need less than about 75% of full power. Cutting engine speed by 20–30% of rated speed is generally safe, within the range your operator’s manual allows. Do not lug the engine: excessive black smoke is one sign of overload. To check a setting, work briefly and then open the throttle quickly. If the engine picks up speed readily, the setting is fine; if not, shift down or raise the rpm. Iowa State’s Mark Hanna wrote in 2011 that the practice can easily improve fuel savings by 10%. PTO jobs are the exception, because cutting engine speed also slows the PTO.
Ballast and wheel slip
The University of Kentucky’s Proper Ballast and Tire Inflation (AEN-93) puts best tractive efficiency, in most soils, at about 10% wheel slip for MFWD and 4WD tractors, 13–15% for 2WD and around 6% for tracks. Too little weight wastes fuel in slip. Too much strains the driveline and also lowers fuel efficiency. As a starting point it suggests 120–145 lb per rated hp for MFWD and 2WD tractors and 85–125 lb/hp for 4WD: the lighter end for fast work, the heavier end for slow, high-draft work.
To measure slip without a monitor, set two flags 200 ft apart and count rear-wheel revolutions between them, once with the implement raised and once with it working. Slip % = (revolutions working ÷ revolutions raised − 1) × 100.
Tires and inflation
Kentucky’s extension engineers note that most producers overinflate. Aim for the lowest pressure the tire maker’s load table allows for the weight on each tire, set cold. Radials give better fuel efficiency than bias-ply but need more careful pressure management. Adjust ballast and inflation together, starting from the tractor and tire manufacturers’ recommendations.
Transmission
According to Virginia Tech, continuously variable transmissions (CVT or IVT) pick engine speed and ratio for the load automatically, in effect doing gear up, throttle down for you. With a powershift or manual gearbox, it is up to the operator.
Maintenance
Iowa State’s fuel tables assume properly tuned and adjusted engines, and warn that tractors built before 1990, or in poor repair, may use 10% or more additional fuel.
How to log your own fuel consumption
- Park on level ground and fill to a fixed mark, such as the neck of the filler. Note the hour meter.
- Do one job at a time. Note the acres, implement, gear, engine rpm and conditions.
- Refill to the same mark and record the fuel added and the hours.
- Work out gal/h (fuel ÷ hours) and gal/acre (fuel ÷ acres).
- Repeat for at least three fills per job before you draw conclusions.
- Compare your result with the estimate from the calculator and with Iowa State’s per-acre figures. If your tractor’s display shows a fuel rate, check it against your fill-to-fill numbers.
| Date | Job and implement | Hours (start to end) | Acres | Fuel added | Gear and engine rpm | Conditions | gal/h | gal/acre |
|---|---|---|---|---|---|---|---|---|
| Day of refill | e.g. chisel plow, 15 ft | From hour meter | Measured or mapped | gal or L | As driven | Soil, moisture, slope | Fuel ÷ hours | Fuel ÷ acres |
The log is also your baseline: after any change to ballast, tires, driving habits or engine calibration, it shows whether the change worked.
Next steps
- Put your own figures into the calculator to see fuel per year and cost per year.
- If much of your work is at light or medium load, an Eco Tractor Tune is built to let the engine carry it at lower rpm. We confirm results on the tractor dyno or with your fuel log; there is no promised percentage.
- Deere owners: find your tractor in our John Deere catalog.
Frequently asked questions
How many gallons of diesel does a tractor burn per hour?
As a year-round average, Iowa State uses 0.044 gal/h per maximum PTO hp: 4.4 gal/h (17 L/h) for a 100 hp tractor and 13.2 gal/h (50 L/h) for a 300 hp tractor. Under a steady load, the range is wider; see the table above.
How much fuel does a 100 hp tractor use per hour?
About 3.0 gal/h (11 L/h) at quarter load to 6.2 gal/h (24 L/h) at full load, by the ASABE equation at full throttle. Nebraska-tested MFWD tractors of 80–120 PTO hp averaged 6.2 gal/h at maximum drawbar power.
How much fuel does a John Deere tractor use per hour?
About the same as any tractor of the same size and load: horsepower and how hard the tractor works matter more than the brand. The Nebraska test of a 116 PTO hp John Deere 7610, for example, measured 6.82 gal/h at rated PTO power. For your model, find its Nebraska or OECD report and divide horsepower by hp-hr/gal.
What is a good hp-hr/gal for a tractor?
Virginia Tech puts diesel tractors at roughly 12–21 hp-hr/gal, with about 13.5 average for drawbar loads and 18.5 very efficient for PTO work. Only compare figures from the same test condition.
Does lowering engine rpm save fuel?
Yes, on jobs that need less than about 75% of full power, if you shift up to hold travel speed and do not lug the engine. In Nebraska tests, most tractors used 15–30% less fuel at half pull in a faster gear at reduced engine speed. On PTO work it also slows the PTO.
What is the most fuel-efficient tractor?
No single model wins everywhere: efficiency changes with size and test condition, and a tractor can lead one test and trail in another. To choose a fuel-efficient tractor, compare Nebraska or OECD results for the size you need on the same test line, paying most attention to the part-load, reduced-engine-speed drawbar tests. Then size it to your implements and keep ballast, tires and maintenance right.