The RAM 6.4 mileage is terrible with a heavy load like a camper, the lie-o-meter says 13mpg, hand calculation will be 9-10, exactly the same as my 6.0. Empty, the RAM 6.4 mileage is better than the 6.0 by about 2mpg. I'm really hoping this new 6.6 knocks it out of the park with decent mileage, good power, and the same or better durability as the 6.0.
I keep gas receipts for every gallon purchased for my vehicles. Here is my annual calculations (April each year) for 2012 2500 Extended Cab 4X4 6.0 with a 3,200 lb truck camper and towing a 16' trailer with a SXS on weekends. I have no reason to claim 15mpg, I carry a heavy load that will even bring a diesels mileage down. 2017-2018 4,332 Miles Driven 424.87 Gallons of gas 10.19 MPG $1,219.25 Total gas expense $2.86 Avg per gallon 2016-2017 3,786 Miles Driven 378.81 Gallons of gas 9.99 MPG $1,961.45 Total gas expense $2.53 Avg per gallon 2015-2016 4,572 Miles Driven 432.11 Gallons of gas 10.58 MPG $1,133.19 Total gas expense $2.62 Avg per gallon 2014-2015 4,500 Miles Driven 421.42 Gallons of gas 10.67 MPG $1,515.11 Total gas expense $3.59 Avg per gallon 2013-2014 (camper July 2014) 6,557 Miles Driven 581.33 Gallons of gas 11.28 MPG $2,222.86 Total gas expense $3.82 Avg per gallon 2012-2013 7,058 Miles Driven 537.22 Gallons of gas 13.13 MPG $2,133.05 Total gas expense $3.97 Avg per gallon
I have a 2012 that just rolled 30,000 a few weeks ago. Low mileage is possible if it is not a daily driver and only used occasionally. Mine is used in the summer to carry our truck camper and tow a trailer with a UTV. Basically a weekend work truck in the summer and occasional use in the winter.
I'd recommend going to a 2011 or newer for the upgraded chassis over the 07-10 models. Everything under the body was upgraded with heavier suspension and 6.0 engine/transmission updates. Fuel mileage of the 6.0 2500 is not what your 5.3 1500 gets, but it tows and hauls sooooooo much better.
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