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I have a 2018 Honda Accord XL 4 cylinder turbo. At one point my mpg average was between 38-40mpg and seems to be dropping. It got as low as 26mpg. Now it averages the low to mid 30's. I use 93 octane gas. It happened in warmer weather. Anyone know why?
 

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Could be the difference of winter and summer blend gas. If nothing has changed regarding driving habits, roads travelled, and using same brand fuel that is the only thing that comes to mind.
 
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