Thanks good website, it shows significantly lower mpg than stated by mfg and epa.
So 2 to 3 mpg improvement over 3.5 without elecric. Or about same mpg as the 2.7 motor. But the electric assist 3.5 does boast the highest horsepower.
A 2.7 with electric assist and bigger battery could do very well. The trend with electric seems to be high horsepower. If we were targeting just efficiency and made a 200 hp truck excellent economy could be had, but who actually wants that?