Originally Posted by GreaseMonkey
17.5? Wow I have a hard time believing you, unless you're going 55 everywhere.
I have trouble getting 14 mph with my 5.9L V8.
well I wasnt towing to get that....guess I should have said that :miff:...I got almost 19 in the suburban I owned previously to the V10.
I did the same thing to both, K&N air filter, mobil 1 full synthetic oil and Bosch Platinum +4 plugs (that was expensive on the ford