Originally Posted by Roki303
Here is an interesting article (from 8/24) about 2013 Dodge Ram's MPG:
Apparently MPG (for V6) went from 14/20 to 18/25 which I think is fantastic. Seems like very similar technology was added that we will see in 2014 GC.
Obviously makes you wonder how much of an mpg bump 2014 will get for V6/V8 models. Diesel's mpg will be interesting as well.
They totally changed engines. I'd expect 1 or 2 mpg extra at most from the new transmission.
As mentioned previously, the EPA testing is fairly inaccurate to actual driving. Certain other American car makers *cough* GM *cough* have exploited this on some of their newer vehicles, with models that have hugely amazing EPA ratings, but real life numbers fall far short of that.
EDIT: I think the logical thing to do is look at the most similar competition to the GC - the ML. With its 7 speed transmission (let's call this a wash with the 8 speed, because it's likely MB will have this transmission optimized better than the 8 speed will be by Jeep), more advanced engines than Jeep has (turbo V8s), and a gearing set more for economy than offroad prowess less weight, and a less rugged and more efficient awd system, the ML350 does 17/22 while the ML550 does 15/20. The VW Touareg with an 8 speed transmission is rated at 16/23 (admittedly, it's V6 is a bit outdated, but is still a great powerplant) despite being lighter and less offroadable than the Jeep.
I really don't see this transmission improving on the fuel economy that much, considering that the Jeeps already have stellar fuel economy compared to their rivals. The Touareg only gained 3 mpg when it went from the 6 speed to the 8 speed, and it also got a host of other changes including making it much lighter, making its 4x4 less rugged and more efficient, etc.
Again, I'd expect a 1-2 mpg difference in fuel economy with the 8 speed, based on empirical data.