Welcome to the site Tundra-Trooper-06.
A bunch of guys around here have fun trucks for weekend mudding and romping around now and then. What I would suggest if you must have your truck is purchase an inexpensive vehicle for commuting during the week when you put the most miles on. You can mod your tundra for better mileage, but you'll never come anywhere near close to what a small or even medium sized car will do without any modding.
If you can't do that, your last option would be to check out the
65+ mods list and more importantly the
100+ hypermiling tips. The hypermiling tips will show you immediate results and likely more than you'll see from modifications.