I think I may have been doing the calibration wrong for my 2005 Kia Spectra.
Tried to calibrate distance, went 4 miles on the interstate but ended up with a calibration factor of 0.8. Clearly that isn't right so I went back to 1.
When I did my first tank and entered amount used to calibrate fuel, I had a calibration factor of 1.1. (10% less than indicated
) On the next tank I did another calibration and suddenly my factor was 1.22... Although I did get pretty poor fuel economy on that tank, and I have been using different pumps. I also know I have a long filler neck on my tank.
The vehicle has a MAF sensor and stock wheels and tire size, so I just can't imagine these numbers being so far off. Just curious as to what factors are normal.