gas engine tuners
The gas engine tuners are nowhere near as effective as for a diesel. It is hard to get more power out of a gasser without advancing the timing--this requires premium fuel, and the extra cost for gas will negate any fuel mileage increase. At least this has been my experience with a Ford V10, maybe the tuners have figured out some other way now.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired