How to Use the Propane Autogas Annual Fuel Cost Calculator
Propane (LPG) as a passenger car fuel is common in some countries, but in the US it's mostly a commercial and fleet fuel — think forklifts, delivery vans, school buses, and taxi fleets — rather than a typical choice for personal vehicles. If you do run a propane autogas vehicle or are evaluating a fleet conversion, this calculator still applies the same math: fuel economy and price per gallon determine your real cost.
Enter your annual mileage, your vehicle's fuel economy on propane, and the price per gallon to get your total annual fuel cost and average monthly cost. Propane is usually priced lower per gallon than gasoline, but most vehicles also get noticeably fewer miles per gallon on propane, so the pump-price gap alone doesn't tell you whether you're actually saving money.
To compare fairly against a gasoline or diesel vehicle, run the same mileage and price assumptions through a comparable fuel cost calculator and look at the total annual number rather than just the price at the pump. For fleet operators, propane's price stability and lower emissions are often a bigger factor in the decision than fuel cost alone.
Frequently Asked Questions
Propane is typically priced lower per gallon than gasoline, but fuel economy also tends to run lower, so you need to compare actual cost per mile rather than just the pump price.
In the US, propane autogas is mostly used in commercial and fleet settings — forklifts, delivery vans, school buses, and taxi fleets — rather than typical personal passenger cars, unlike in some other countries where LPG passenger cars are common.