Doesn't the 2.3 get better mileage than the 2.7, even with 35 inch tires?Yep, I'd guess that the biggest factors will be , in no particular order:
the increase of tire/rim weight, added rolling resistance from wider tires, added drag(wind resistance) from the lift/extra overall height(larger frontal area).
I think I just listed the top 3 things that will kill fuel mileage on any vehicle.
So yeah, if you are looking for fuel mileage, stay FAR away from the samsquatch. Stay with those skinny 255 tires and no lift..... or go nuts with all of that and buy an Ecosport for a daily driver!