I didn't buy a tundra for it's fuel economy. I bought because it can tow a load and you never have to put parts in them, they just keep rolling. On my second tundra now.
Family of 5, all under 8yrs old. About $700 a month, we raise all our own meat, except what hunt and catch. Only thing that puts us over, is when she gets a wild hair and wants to spend $ 75 on ingredients to make a single meal that she saw on Pinterest. "Honey maybe we should have eaten take...
I would definitely recommend going to a community college for a year or two, just to get the crap classes out of the way. Close to home, so you can ease in to college. And then finish where you want too. Save some coin too!