6-speed vs. 8-speed, from the 2013 EPA *raw*, unadjusted test data:
Ram 1500 Hemi, 5500 ETW, 4WD:
Truck L9DS10852 6-spd, 3.55 FDR, 25.3 N/V. MPG Highway 25.6 City 16.5
Truck R3DS19935 8-spd, 3.21 FDR, 22.8 N/V. MPG Highway 28.6, 28.4 City 17.6, 18.4, 18.5
and the 2WD Ram 1500 Hemi, 5500 ETW,:
Truck L9DS10852 6-spd, 3.55 FDR, 26.0 N/V. MPG Highway 27.1 City 17.0
Truck L3DS19531 8-spd, 3.21 FDR, 22.8 N/V. MPG Highway 29.6, 30.1 City 18.5
ETW is Emissions Test Weight;
N/V is the tire "rev's per mile" and can be used to back-figger out which tire was on the test vehicle.
pretty sure none of these is with the base 17" (N/V 23.6)
it seems odd that the same vehicle was used for both 6-spd 2WD & 4WD tests,
but different tires ? may be a typo, may be real ..
before you freak out about how high these MPG results are, read
to understand more about the EPA testing and cycles
search for 'EPA test car data' if you wish to download the actual Excel files;
not much there for the 2013 1500 hemi's..
there's more V6 stuff, not surprisingly.