Is propane cheaper than gasoline for generator operation?

Energy Content Comparison

Propane and gasoline have different energy densities, which affect their prices and usage. Propane has approximately 91,500 BTUs per gallon, while gasoline has around 115,000 BTUs per gallon. This means propane requires more volume to produce the same amount of energy as gasoline. However, propane is generally cheaper than gasoline, with current prices often 10-20% lower.

Generator Dual Fuel Considerations

When choosing between propane and gasoline for a generator, consider the application, location, and usage patterns. Propane is a better choice for long-term or high-demand operations, as it can be stored for extended periods without degrading. However, gasoline is more suitable for short-term or low-demand applications, where its lower upfront cost is advantageous. Dual-fuel generators can run on either propane or gasoline, making them a versatile option.

Cost Comparison Example

To illustrate the cost difference, assume a 10kW generator running for 100 hours per month. If the generator uses propane at a rate of 2.5 gallons per hour and gasoline at 1.5 gallons per hour, and the current prices are $2.50 per gallon for propane and $3.50 per gallon for gasoline, the monthly propane cost would be around $625, while the monthly gasoline cost would be around $825. This calculation demonstrates how propane can be a more cost-effective option in the long run.