Diesel Fuel Cost Calculator
Calculate fuel expenses for diesel generators, agricultural machinery, and heavy equipment, supporting on-road and tax-exempt off-road dyed diesel.
Diesel Order & Delivery
Diesel Fuel & Energy Equation
Total Cost = (Gallons × Price per Gallon) + Additives | Total Energy (BTU) = Gallons × 138,500 BTU/Gal- Fuel Grade: On-road clear diesel (includes federal/state highway excise taxes) vs off-road red-dyed diesel (tax-exempt for generators, farms, and construction).
- Energy Density: No. 2 diesel provides approximately 138,500 BTU (40.6 kWh equivalent) per gallon (~21% higher energy density than gasoline).
- Cold Weather Additives: Anti-gel treatments to prevent paraffin wax drop-out in sub-zero winter temperatures.
Step-by-Step Worked Example
Calculation Steps:
How to Use This Calculator
Assumptions & Limitations
- Energy content is based on standard Ultra-Low Sulfur Diesel (ULSD No. 2) at 138,500 BTU/gal.
- Off-road diesel is legally restricted to non-highway equipment, generators, and farm machinery.
Frequently Asked Questions
Why are diesel generators more fuel-efficient than gasoline generators?
Diesel fuel contains roughly 21% more energy per gallon than gasoline (138,500 vs 114,000 BTU). Additionally, compression-ignition diesel engines operate at much higher compression ratios, burning 30% to 40% less fuel volume per kilowatt-hour produced.
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