In January I replaced my 2004 Honda Element engine with a used (roughly 150k miles on it) Honda Element engine. Engine runs great but issue I have is that instead of getting 20 to 23 mpg on highway I am now only getting 17 to 18. I can actually get a few more mpgs running around town. Idle is where it should be. Engine was installed by Honda dealership. Anyone have any ideas as to why I have lost so many mpgs? Things I can try to help make it better?
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