Gas vs Diesel Cost Calculator

Gas vs Diesel Cost Calculator. Gasoline and diesel engines have different fuel efficiency and pump prices, so the cheaper vehicle at the dealership isn't always cheaper to drive. Enter your annual miles driven, gasoline and diesel prices per gallon, and each vehicle's MPG into the Gas vs Diesel Cost Calculator to see your annual fuel savings. Secondary outputs include gas and diesel annual fuel costs, monthly savings, and cost per mile for each fuel type. Also try the find Required Injector Size with Fuel Injector Size Calculator.

Results

Annual Fuel Savings

Gas Vehicle Annual Cost

Diesel Vehicle Annual Cost

Monthly Savings

Cost per Mile (Gas)

Cost per Mile (Diesel)

How much can I save by switching from gas to diesel?

Diesel vehicles typically get 20-40% better fuel economy than gas vehicles, but diesel fuel costs more per gallon. Your actual savings depend on the price difference between fuels, vehicle efficiency, and annual mileage. Use our calculator to get personalized results. See also our Fuel Consumption Calculator.

What factors affect fuel costs the most?

The biggest factors are fuel efficiency (MPG), annual mileage, and fuel prices. A vehicle with higher MPG will cost less to operate, while driving more miles increases total fuel costs. Regional fuel price variations also significantly impact your expenses.

Are diesel vehicles always more fuel efficient?

Generally yes, diesel engines are more efficient and provide better fuel economy than gasoline engines. Diesel fuel contains more energy per gallon, and diesel engines convert fuel to power more efficiently, typically achieving 20-40% better MPG.

Should I consider maintenance costs when comparing gas vs diesel?

Yes, diesel vehicles often have higher maintenance costs due to more expensive oil changes, fuel filters, and specialized parts. However, diesel engines typically last longer. Consider both fuel savings and maintenance costs for a complete comparison. You might also find our calculate CAFE (Fuel Economy Standard) useful.

How do fuel prices vary by region?

Fuel prices can vary significantly by state and region due to taxes, transportation costs, and local market conditions. Check current local prices at gas stations or use AAA's fuel price tracker for accurate regional pricing.

What's the average annual mileage for calculating fuel costs?

The average American drives 12,000-15,000 miles per year. City drivers might average 10,000 miles, while rural or commuting drivers could exceed 20,000 miles annually. Use your actual annual mileage for the most accurate calculation.

Do hybrid vehicles compare favorably to diesel for fuel costs?

Hybrid vehicles can achieve similar or better fuel economy than diesel vehicles, especially in city driving. However, hybrids typically use gasoline, so the comparison depends on gas vs diesel prices and driving conditions in your area.