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On my 17 86 I have an k&n drop in and nitrogen in tires I run 93octane gas and live in the desert. Crushing on the highway at 72mph I average 44+mpg now in the cool months.
I have found that with these 3 things I increased 9-13mpg depending on temps and driving style. In town I average 25mpg.
Side note I have tested this on wrx, Imprezas, b9 tribeca, and s2ks and have seen increases across the board and no decrease.
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