MPG Calculator

Work out your fuel mileage

Distance covered, fuel it took to fill back up, and which engine you are running. That is everything we need.

Miles & US gallons Kilometres & litres

Distance driven (miles)

Fuel added (gallons)

Engine Select your engine 250 I6 — Gas — carbureted 292 I6 — Gas — carbureted 305 V8 — Gas — carbureted 307 V8 — Gas — carbureted 350 V8 — Gas — carbureted 400 V8 — Gas — carbureted 454 V8 — Gas — carbureted 4.3L V6 — Gas — TBI & Vortec 5.0L V8 (305) — Gas — TBI & Vortec 5.7L V8 (350) — Gas — TBI & Vortec 7.4L V8 (454) — Gas — TBI & Vortec 8.1L V8 — Gas — TBI & Vortec 4.8L V8 — Gas — LS, 1999 to 2013 5.3L V8 — Gas — LS, 1999 to 2013 6.0L V8 — Gas — LS, 1999 to 2013 6.2L V8 — Gas — LS, 1999 to 2013 4.3L V6 — Gas — 2014 to present 5.3L V8 — Gas — 2014 to present 6.2L V8 — Gas — 2014 to present 2.7L Turbo I4 — Gas — 2014 to present 6.2L Detroit diesel — Diesel 6.5L turbo diesel — Diesel Duramax LB7 (2001–2004) — Diesel Duramax LLY (2004–2005) — Diesel Duramax LBZ (2006–2007) — Diesel Duramax LMM (2007–2010) — Diesel Duramax LML (2011–2016) — Diesel Duramax L5P (2017–present) — Diesel 3.0L Duramax I6 — Diesel

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Calculate Add mine to the community numbers

What gets stored: your MPG figure and the engine you picked. No name, email, or location.
It goes into the public average for that engine, never shown as yours. Nothing links it back to you, so it can't be pulled out later. Untick the box if you'd rather not.

Latest submissions

The last 3 tanks submitted here.

• 250 I615.0 mpg
• 5.3L V814.8 mpg
• 5.3L V814.8 mpg

How to get a number you can trust

Trip-computer readouts drift, and a single tank tells you almost nothing. Do it by hand at least once:

1. Fill until the pump clicks off. Note the odometer, or zero a trip meter.
2. Drive the tank down. Half a tank is enough, a full one is better.
3. Fill again at the same pump, to the same first click. Note the distance and the fuel it took.

The math is distance divided by fuel. 312 miles on 21.1 gallons is 14.8 mpg. Filling to the same click at the same pump both times matters because you are measuring the fuel you burned, not the fuel in the tank — a pump that shuts off early on one visit will skew the result.

Why your number differs from the truck beside you

Two trucks with the same engine can be four or five mpg apart and neither one has a thing wrong with it. Roughly in order of how much they move the needle:

• Tires. Bigger and heavier costs you twice, in rolling resistance and in effective gearing. It also makes the odometer read short, so your calculated mpg comes out higher than reality until you correct for it.
• Gearing. 4.10s and 3.42s are different trucks on the highway.
• How you drive it. City and highway are not close. Neither is 65 and 80.
• Load and towing. A loaded bed or a trailer changes the answer completely.
• Cylinder deactivation. AFM and DFM only help if the truck actually spends time in reduced-cylinder mode. Big tires, a heavy right foot, or a tune that disables it all take that back.
• Winter fuel and cold starts. Winter blends carry less energy and a cold engine runs rich. One to two mpg down from summer to January is normal, not a fault.
• Ethanol content. E10 holds less energy per gallon than straight gas, and E85 far less.
• Condition. Dragging brakes, a tired O2 sensor, a plugged filter, low tire pressure. If you have fallen well off your own historical number, that is the signal worth chasing — not a comparison against somebody else's truck.

How the comparison works

• Bands come from the actual submissions for your engine, not from fixed targets.
• We report the median rather than the average, because one mistyped entry drags an average badly on a small sample.
• Nothing shows until an engine has at least 5 submissions. Below that you see recent results instead.
• Landing in the bottom third is not a verdict on your truck. Towing, city driving, 35s and a lift will all put you there legitimately.
• Submissions are anonymous. We store the engine and the figure. You can opt out with the checkbox before you calculate.

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