![]() ![]() ECODRIVE I-80: A Large Sample Fuel Economy Feedback Field Test (ITS-RR-13-15). Institute of Transportation Studies, University of California, Davis.Sensible driving saves more gas than drivers think. Fuel Consumption Sensitivity of Conventional and Hybrid Electric Light-Duty Gasoline Vehicles to Driving Style, SAE Int. Therefore, our cost and savings estimates should be conservative. These estimates are typically higher than both the EPA highway MPG ratings and the MPG consumers experience in on-road highway driving. We estimate vehicle MPG at steady-state cruising speeds based on the vehicle's EPA "highway" fuel economy rating. Their applicability to plug-in hybrids and electric vehicles is unknown. These estimates work best for well-maintained modern gasoline light-duty vehicles and will likely be less accurate for diesels, hybrids, and vehicles with cylinder deactivation. Only one diesel and two hybrids are included no plug-in hybrids or electric vehicles were tested. Almost all are conventional gasoline-powered vehicles. Speed-mpg relationships are based on dynamometer tests of 74 light-duty vehicles representing a variety of manufacturers, nine vehicle classes, engine sizes 1.5 L to 6.2 L, and model years 2003 to 2012. MPG R = fuel economy at reduced highway speed.MPG T = fuel economy at typical highway speed.Savings = (Fuel Price * (1 ÷ MPG T)-(1 ÷ MPG R)) ÷ ((1 ÷ Speed T)-(1 ÷ Speed R)) ![]() Savings per extra time incurred is calculated as the money saved by slowing down divided by the extra time incurred: Cost per gallon and cost per 100 miles show the difference in cost at your typical highway speed and the cost at the reduced speed. Save Money: This graph shows how much money you can save by slowing down. MPG at Higher SpeedĬost/100 Miles: This is useful for estimating fuel costs for long trips.Ĭost per 100 Miles = Fuel Price ÷ Estimated MPG × 100 The price of fuel doesn't actually go up, but this is a useful way to put the cost of driving faster in context.Ĭost/Gallon = Fuel Price at Pump × Est. At higher speeds, the estimated price per gallon is increased based on the additional fuel you use by driving faster. A quick guide to the different kinds of hybrids and electric vehicles.Ĭost/Gallon: When driving 50 mph, price per gallon is assumed to be the same as the pump price. ![]()
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