Wheels and Tires

Okay, I'm new here. (Third time trying this as when I added pic screen changed and lost everything). Not sure if I could have just searched for info. I have an 08 Taco USED with 18 inch XD's (not sure part number) on Nitto Terra Grapplers 305/60R18's. These wheels weigh about 38 lbs and am getting like 12 mpg... I would like to go smaller/lighter like 17's and tires but not sure what a good setup would be. What are y'all running and what MPG y'all getting? I just don't really want to spend $1500 on new set of tires if I could get new wheels and tires for less and improve MPG. I would like to still have all terrain tires. Thanks.

 

I run 285/70/17 Nitto G2s. Just did a 600 mile trip on Monday drove the speed limits got 19.8 mpg that day, but have gotten 20.5 at times. Get 17/18 city.

 

I run 235 85 16 Falken Wildpeaks and I'm getting 22 mpg (hand calculated, adjusted for tire diameter). However I also have a 4 cylinder 5 speed manual.

I am a fan of taller, narrower tires because I think it's a good compromise of capability without giving up to much mpg.