First and foremost:
- If you worried about gas consumption now, you should simply not think about purchasing a 6000lb SUV, of any make. They will all get "bad" gas mileage.
The reasons on getting a large SUV are for: Safety (bigger wins), comfort, amount you are carrying/towing (large family, boats, horses, "stuff").
Second:
You can't increase the gas mileage without causing other issues. You can put on smaller tires, re-gear, etc. but they all effect the overall performance of the vehicle. Some claim mileage increases when they increase HP and Torque, but even if true, the result is that one has to use Premium gas instead of regular, at what, and extra 30 cents a gallon?
In any case, the money I have seen people spend on Hp/Mileage increases will take a LONG time to pay back, if ever.
Finally, the MPG:
Miles PER gallon:
- Set tripmeter to zero
- fill up tank
- drive (usually to near empty)
- divide the number of miles driven by the number of gallons needed to fill the tank up.
or, if the Exby has it, the message center automatically does this for you.
Note: The above methods are not accurate if you change tire size without recalibrating the system.