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The newer your car gets, the more difficult it is to improve your mpg for the most part. I have a 2002 Toyota Corolla with a widdle bitty 1.8L and automatic transmission and the best result I've had is 42 mpg on a 4 hour toll road trip from Toledo to Chicago. Now if I had a Civic that was TEN years older I could have easily hit the low to mid 50's no problem. As the years progress, the weight increases generally as well as engine size, so the newer the car, the harder the fight.
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