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Originally Posted by nickvash0104
Check your filters... fuel / air, make sure they're clean. Spark plugs, properly inflated tires, make sure your injectors are clean... all basic tips for better mileage. I believe MKIIIs get avg. economy of around ~19 mpg city, ~25mpg highway... though I may be off.
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Yep, all that, especially tire pressure. I gained 1 mpg running 35psi instead of 32psi. A tab bit bumpier on the little bupms, tho. 15.5 city...21 hwy. using 89 octane. 89 N/a with intake/2.5" exhaust.