Hello all, I’m new here & recently bought a 2006 F-350 4x4 DRW Crew Cab Lariat 6.0L V-8 Diesel with a 4.3 ratio limited slip axle to pull a 37’ fifth wheel camper. As you can guess the fuel mileage is less than desirable. I’m currently looking to purchase a Quadzilla M3 Ford MAX Mileage Module but can’t find much info if it has a good track record. Does anyone have any experience with this product or can offer some advice on how to improve the fuel mileage? As far as power goes I am well pleased with how easy the truck pulls the camper. I’ve had no problems pulling in the mountains. Thanks
I have the '07 version of that truck basically, though I have yet to put that kinda load behind it. The first thing I did was a set of gauges, which in hindsight all you really need is an Edge Insight CS/CTS to keep an eye on everything, get the expandable Pryo and Fuel Pressure sensors if you can manage it. That is the easiest way to prevent little issues from costing a fortune in the long run.
For tunes, The SCT tuner is the only way to go. I ran IDP's street and X-Race with a factory exhaust (including CAT) and didn't have an issue with EGT's climbing to bad at all. The tow files on the SCT are remarkable, it will firm up the shifts and take full advantage of the engine braking of the VGT.
I like the 4.30's at stock height, never had an issue in the steep grades, and don't have an issue getting up to speed on the interstate.
For comparison, Stock - 10-12 City, 13.5 combined, and 15 mpg Interstate.
Tuned - Tow, I've managed the do .5-1mpg better than stock emtpy with a 7K load.
Street - 11-13 city, 14.6 combined, and 16+ mpg Interstate.
X-Race - 11-14 city, 15.3 combined, and 16.5 + mpg Interstate.