Lexus SC 430 Gas Mileage Reports
Share your actual MPG with other SC 430 owners here.
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Highway average speed 45 mph gets 32.5 mpg
Highway average speed 55 mph gets 27.5 mpg
Highway average speed 65 mph gets 25.0 mpg
city stop&go average speed 18.3 mph gets 16.5 mpg
Thus you increase your gas mileage by 10% by slowing from 65 to 55 mph and by 30% by slowing from 65 to 45 mph. At a slow and steady 45 mph the 20-gallon tank should take you 600 miles.