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I would like to submit a bit of information in regards to fuel mileage as I have the H & S tuner. 1)Canadian gallons equal 4.54 litres as compared to U.S. gallons which egual 3.78 litres. 2)Trucks on the Canadian side seem to be getting higher mileage per gallon, this is due to a larger gallon. 62 mile per hour U.S. equals 100 kilometer per hour Canadian.
Not condeming anyones driving, but here are a few things that mileage depends on: 1)it takes several miles for the engine, drive line (rear ends, transmission) to come up to normal operating temperature. 2)using cruise where one slows to a restricted speed (through a town etc. on the highway) then instead of using the foot feed to gradually return to normal speed, the return to cruise is selected where upon the RPM ramps up to return to set speed. 3)constant passing. 4)bucking wind. 5)driving at a higher rate of speed, over 60 mph or 100 kms. even if at a legal speed limit. On average this is where the better fuel mileage is obtained in relation to speed, even a bit slower may be benificial. 6)pulling any type of trailer and the higher and wider the front the more restriction. 7)altitude (mountain or higher hills driving). 8)tire inflation (low tire pressure creates more drag or resistance). 9)mechanical condition of the vehicle. 10)tuner setting. 11)city driving versus highway driving. This applies to all makes and models of vehicles.
Not condeming raised or high lift vehicles as I have had them to, but raising the vehicle causes more wind drag underneath.
The DPF and CAT delete with the H & S tuner has helped improve fuel mileage and over time as your truck reprograms itself to show it does not require extra fuel for regeneration etc. mileage will improve. I have not used the other tuner brands mentioned in the forums but feel these will do the same will very little difference.
Last edited by justlearning; 06-03-2012 at 04:46 PM.