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Old October 22nd, 2019, 05:52   #7
Certified Volkswagen Nut Vendor
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

I have found over the years that the MFA's fuel economy trends closer to accurate the longer the trip is. So for shorter trips (less than 100 miles) it trends to 5-8% higher than actual, but for a 500 mile trip it ends up closer to 2-3% accurate. But it is always on the side of optimistic. Plus, it is going by the fuel measured by the ECU as being injected into the engine, not by fuel gauge position, although gauge position is what the MFA uses to calculate "distance to refueling". Which I always get a kick out of when you start out with a full, vented tank, because THAT value goes UP for the first ~50-100 miles.
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