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Calculate total road trip gasoline or diesel expenditure, fuel consumption volume, miles-per-gallon (MPG) / liters-per-100km efficiency, and per-passenger travel cost distribution.
ext{Gallons} = rac{ ext{Distance}_{ ext{miles}}}{ ext{MPG}}. For Metric: ext{Liters} = ext{Distance}_{ ext{km}} imes left( rac{ ext{L/100km}}{100}
ight). ext{Fuel Cost} = ext{Volume} imes P_{ ext{fuel}}. ext{Total Expense} = ext{Fuel Cost} + ext{Tolls} + ext{Parking}. ext{Cost per Rider} = rac{ ext{Total Expense}}{N_{ ext{passengers}}}.Vehicle aerodynamic drag increases with the square of velocity. According to the U.S. Department of Energy, driving at 75 MPH burns approximately 20% more fuel than driving at 55 MPH, and driving at 80 MPH burns nearly 28% more. Maintaining 60–65 MPH with cruise control yields optimal fuel economy.
To convert US MPG to Metric L/100km: L/100km = 235.215 / MPG. To convert L/100km back to US MPG: MPG = 235.215 / (L/100km). (For Imperial UK gallons, the constant is 282.481).
Yes. In high summer ambient temperatures, running the A/C can reduce fuel economy by 5% to 20% due to compressor engine load. At speeds below 45 MPH, opening windows is more fuel-efficient; at highway speeds above 55 MPH, aerodynamic drag from open windows consumes more fuel than running the A/C.
Under-inflated tires increase rolling resistance. For every 1 PSI drop across all four tires below the manufacturer recommended door-jamb specification, fuel economy decreases by roughly 0.2%. Maintaining optimal pressure improves mileage by up to 3% while extending tire tread lifespan.