I own Ford F250 Superduty, that I use to pull a 27 Ft. fifth wheel. With the price of gas at $2.00 I have been looking at Tuners that load new setting in the Trucks computer,but am not to sure if they work as good as adverticed . Has anybody used one of this tuners, I have found Superchips Flash Paq Tuner, Manufactured by Superchips Inc. Is the savings on miles per gallon worth the price $385.00.