Join Date: Apr 2008
Location: Wide Awake Wilson, NC
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FWIW, my 12 mega has 35" tires, 3:73s, auto tranny, I and was considering a "regear", as I pull a 5th wheel toy hauler.
I downloaded an RPM vs gear vs tire size chart, and realized there are so many variables. To justify a regear cost, you have to decide on a permanent tire size, and a dedicated tow speed, or towing RPM.
After looking at the chart, ad nauseam, I decided to keep the 3:73s and I just tow in 5th until getting up to 65 or 70, which I can tow in 6th on level ground. When towing I shift manually on the stalk.
In other words, if you can find a tranny gear which will give you the towing RPM, and the towing speed you want, that's obviously the cheapest way to go.
Back to MPGs....For what you are towing, your mileage sounds about right to me with your 3:73s. I just decided to get the engine happy, and let the MPGs fall where they may. My truck seems to be happiest towing around 1800 to 2000 RPM, though I sometimes tow on level ground at slightly less RPM.
16 Mega DRW, Aisin, 4:10s, Fuel wheels, Nitto Mts, Promaxx LEDs.
2015 Jeep GC SRT.
2014 Jeep GC Overland Diesel
1986 Jeep CJ-7 Last of the real Jeeps!!
2012 Shelby GT500...Borla Axle backs, TVS blower, JLT 127mm intake, Ford Racing 65mm TB, AFCO dual-fan HE, and Forgestar CF-5 wheels.
Last edited by NC4stroker; 10-19-2014 at 12:47 PM.