Gasoline prices on the rise again - Northeast Mississippi Daily Journal(Gas Mileage)

It can lower your gas mileage by 33 percent at highway speeds and by 5 percent around town. While each vehicle reaches its optimal fuel economy at a different speed (or range of speeds), gas mileage usually decreases rapidly at speeds above 60 mph. Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage by an average of 4 percent, though results vary based on the kind of repair and how well it is done. For example, using 10W-30 motor oil in an engine designed to use 5W-30 can lower your gas mileage by 1-2 percent. read more

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