Take it easy at stoplights. Stoplight racing does a good job of turning gas into brake dust and heat. Keep your tires inflated at a normal pressure. Use the AC on the highway if it's hot, open the windows around town.
Once you go above about 60 mph, wind resistance increases dramatically. Power to overcome wind resistance at 100 mph is about 8 times wind resistance at 50 mpg. Could be as low as 5 times or as great as 10 times.
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