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Yes, I have noticed that the MPG calculator is off. Since I don't have far to drive to work, and I travel overseas a lot, I let my wife drive the ISF to work 4 days a week...mostly highway driving (70+ miles round trip to work).

I drive the ISF hard in short bursts only, so the tank average usually doesn't suffer too bad. The tank average indicator usually says around 19 MPG. Every time I calculate the actual tank average when filling up, it is right about 20 MPG...so for me, it has been off by about 1 MPG.
 
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