I would much rather use ethanol free but when there aren't many stations near that have it and I can get 30-70¢ off a gallon at Kroger, I fill up there. I've maxed out my tires to 42psi even though they are rated for 35psi. I keep the throttle under 2k rpm almost always and on the freeway I only go 65-70mph. I don't carry much extra in the truck but I do keep some tools and truck stuff that I sometimes need: small basic tool set, tow strap, chain, hitch, flashlight, etc. The less weight the better. I have not tried running premium fuel to test the difference, it's really hard to justify to spend the extra money. I've read that some gain a couple mpgs but that could be negated by the extra cost. I've ripped out a secondary carbon air filter, main filter still intact of course. I think that may have gained me a .5mpg with the less restriction. I try to coast whenever possible and don't accelerate fast from stops. I don't idle the truck for long periods of time. If I run inside for a couple minutes, it gets shut off. I also try to avoid using the a/c in town at low speeds but with the heat and humidity, that doesn't happen often. I run synthetic 0w-20 Amsoil. Light oil, less load on the engine. I don't use it for the purpose of fuel economy but I figure it can't hurt it. Probably this week I'll be getting a light weight tonneau cover. I hope that gets me something. I'll also be relaxing the air filter, something less restrictive but not an oiled one...bad for MAF. I could go with an intake and exhaust system but the cost totally negates any savings on gas. I didn't buy the 5.7L Tundra for the fuel economy. But I'll do what I can to improve it. I average 16-16.5mpg normal daily driving. Freeway I can get 18.5-19mpg. this is also making me hesitate getting a leveling kit and more aggressive tires since that will negatively impact my fuel economy. I wish I could get 18-19 mpg all the time.