I know mine isn't an Xl but I always average no less than 14.4 MPG city/street mix during the week. The few highway trips we have done I got close to 19.5 round trip I was stoked at how much further it was compared to constantly stopping and going. And yes the tips above help a lot. I used my ulra gauge with fuel maps and throttle position and real time MPG cals for a while until I got use to driving the truck to its best fuel mileage potential. I do this in all my cars... Before doing the gauge method I was coming in around 9.7-11.2 city.highway mix for work.
The best way to gain mileage is driver habit changes. You could do all the mods in the world but you'll get the best gains learning how to drive it for the best gas mileage period.
The best way to gain mileage is driver habit changes. You could do all the mods in the world but you'll get the best gains learning how to drive it for the best gas mileage period.