Thanks for the insight! I appreciate it!Your best bet for “fuel saver” would probably be a street radial for SUV/truck. The fuel economy will increase with stock size radial tires that are light unlike all terrain or mud tires. This would work great especially if you never off-road. If you ever drive in snow and don’t want two sets of tires you need to be careful that your radials can handle it.
An example for street radials with white raised letters would be this Yokohama Geolandar H/T. This tire weighs around 1lb-5lb less than the terra grapplers and has a highway tread that will pay large dividends for rolling resistance and fuel economy.
On another note I began using Lucas Oils injector cleaner in my daily driver to see if it actually works. While I have only gotten through one full tank I was still able to see a 1.0mpg-1.5mpg increase in my fuel economy. I have not done the math to see if this product is cost effective like it did improve economy.
I am no expert but this is what I can say from my experience of going from stock to oversize mud tires. Do your research on tires and make sure it is absolutely the tire you want on your vehicle for the next few years to come.