MPG's with 87 economy Tune ?'s

[Jackpine]

I see the same relationship between the Gryphon's AECON, my dashboard's info center readout and a manual calculation as you do Lars. AECON is always high and my dash is generally a bit lower than the REAL value. On pure highway driving now, I get about 15.5 mpg. This is a pretty big improvement over stock, which was 1-2 mpg lower.

Mattyp, is your tire size correct? If it is too low, it will record miles driven on your odometer lower also.

- Jack