BIL and I both filled up at the same station, then towed about 3 hours and filled again. We are travelling together, so the route and weather conditions were identical. Outside temps were 100f, route was I15 into Salt Lake City from the north. It is quite hilly. There was a bit of a headwind/front corner wind through the whole trip. A/C in both truck was full blast the entire way.
We drove together more or less, always within sight of each other.
His combo is a 2004 Ram 2500 4x4, Quadcab, long bed, 5.9L Cummins, 48RE auto, 3.73. He has the 305hp/555tq engine. His RV is a 32' TT - a 2008 KZ Spotsman 3204 quad bunk with one slide. UVW 7300#, GVWR 10,000#. I'd guess his RV is about 9000# loaded. His truck is bone stock. Stock tire size, no lift kit.
Here is his truck & RV.
Mine is a 2007 Ram 3500 SRW 4x4, Megacab, shortbed, 5.9L Cummins, 48RE auto, 3.73. Mine is the 325hp/610tq engine. My RV is a 36.5' 5er, a 2010 Cougar 322QBS with three slides. UVW 9540#, GVWR 11,860#. I'd guess mine is about 11,000# loaded as it sits.
I have the hypertech tuner and a 4" exhaust w/muffler. Stock tire size, no lift kit. Stock air intake.
We filled up the morning. We both took 15.18 gallons to fill ($53.00 @ 3.49/gal) at the same station at the same time. We both went 160 miles = 10.54 mpg. Real world, no BS numbers.
I would have thought he would have gotten better mpg than me as the 305hp version of the Cummins is noted for good mpg.
2010 Cougar 322QBS 5er
2007 Dodge 3500 SRW Megacab, 4x4, 5.9L Cummins, 3.73, 48RE auto HYPERTECH MAX ENERGY or DIABLO PREDATOR tuning MBRP 4" Turbo back Scangauge2 for Boost, Coolant temp, Rail press & Trans Temp
Torklift Stable Loads
Well that sounds about right. I have had a couple of different diesel tow vehicles and the mpg were pretty darn close all right in the 10 range. The only way I notice any big difference is if I go 55 instead of 65 that can save me close to two miles per gallon.
how do you compare your throttle use. who gets into the fuel before the grade, or after they hit the grade.. air flow over the roof of the cab then over the 5vr. the trailer the air goes over the cab into the bed, then over around the trailer... he's lighter, but is actually pushing more air.. and remember how each of you drive, may be the difference..
next time trade vehicles and compare..
somewhere in the texas 'lost pines'
currently without rv.
'83' Ford Ranger with a 2.2 Diesel.
'56' Ford F100.
IT seems most diesels will be between 10/11 us gal travelling in the mid 60,s, i averaged 10.19 us from palm springs to kelowna in feb ,hand calc travelling at 65mph,5.9 with a tuner set at 40 hp. 23000 gcw