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Your 29-30mpg at 75mph is a problem, if you're getting 40mpg at 65mph. The 10mpg difference between the 2 speeds, indicates that the extra wasted gasoline is chewing on the engine & other parts. I like lower speeds here in scenic Washington state & am averaging 37.5mpg, including some city driving. Because of the Elantra's low coefficient of drag, I was hoping for higher mpg at higher speeds, but seems that the low 131pounds-feet of engine torque hurts mpg, too.Report it
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