Quote:
Originally Posted by PaleMelanesian
Both ethanol and winter-blend rfg have lower energy content than summer gas, with more oxygenates. Both together is a double hit. Since the Scangauge only measures airflow, it doesn't know that the ECU is adding a little more fuel to the mix to make up the difference. You need to INCREASE the fuel offset % to account for this. (ie. without adjusting, it reads higher mpg than reality)
|
That makes sense to me. The problem is my scan gauge was reading 1mpg lower then the final calculation at the pump(ie. the scangauge thought I had used
more fuel then I did).