Originally Posted by
tgreening
This mileage is highly suspect. Are you relying on the dash display? While accurate enough stock (at least mine is) they are notoriously bogus when you have a tuner installed. Hand calculate is the only accurate way to do it when tuned.
WOW I did as you suggested and was very disappointed with my results. Huge difference in the numbers...actually getting 13.1 with the trailer and I've not had the chance to calculate without.....So my dash read out is useless now???? bummer