Usually not for the average driver. A diesel returns more miles per gallon, but diesel fuel costs more per gallon and the engine adds $4,000-10,000 to the sticker. For a half-ton driven 15,000 miles a year, the diesel burns about $2,727/year in fuel versus about $3,088 for gas — only $361/year cheaper. That thin saving takes roughly 23 years to repay the $8,000 price gap, far longer than most people keep a truck, so over 8 years the gas truck wins by about $5,112. Diesel turns cheaper only at high mileage or heavy towing, where the MPG advantage finally outruns the price and fuel premium.
- Diesel fuel cost: ~$2,727/year (15,000 mi, 22 MPG, $4.00/gal)
- Gas fuel cost: ~$3,088/year (15,000 mi, 17 MPG, $3.50/gal)
- Diesel adds $4,000-10,000 to the purchase price
- Average-mileage break-even: ~23 years, longer than you will own it
- Diesel wins only at high mileage or heavy towing
| Option | Truck price | Fuel / year | 8-Year total |
|---|---|---|---|
| Diesel truck | $58,000 | ~$2,727 | ~$79,818 |
| Gas truck | $50,000 | ~$3,088 | ~$74,706 |
| Difference | +$8,000 | -$361/yr | Gas wins +$5,112 |