Frequently Asked Questions
Why does my real MPG not match the window sticker?
EPA testing is done on a dynamometer under controlled conditions using a standardized drive cycle that favors gentle acceleration and mild temperatures. Real driving includes harder acceleration, higher sustained speeds, cold starts, HVAC loads, and hills. Most drivers achieve 10-20% below the EPA combined rating in typical mixed driving.
How do I convert MPG to liters per 100 km?
Divide 235.215 by your MPG. So 30 MPG = 235.215 / 30 = 7.84 L/100 km. To convert back, divide 235.215 by the L/100 km figure. European fuel economy regulations use L/100 km as the primary metric.
Does higher octane gasoline improve MPG?
Only if your engine requires it. Engines tuned for premium fuel will use more ignition advance when given 91-93 octane, which can improve both power and efficiency slightly. In an engine designed for regular 87-octane fuel, premium provides no measurable MPG benefit and is wasted money.
How much does tire pressure affect fuel economy?
Each 1 PSI below the recommended pressure increases rolling resistance by about 0.2%, reducing MPG by approximately 0.4%. If all four tires are 5 PSI under-inflated, that is roughly a 2% MPG penalty. Check your door-jamb sticker for the recommended pressure, not the maximum listed on the tire sidewall.
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