Both will affect the indicated and average MPG that it calculates.
That's what I meant... both ultimately affect the final FE number that the guage shows.
Simply put - I find it confusing to try and make adjustments on both, at least with my car. The GPS seems to be a sure fire way to calibrate it in my application.
Anyway, safe to say I think Scanguage rocks.
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2005 smart cdi, 799 cc 3-cyl common rail turbo diesel
smartzuuk 
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