As you all have seen as the title, do you wanna get 40mpg? well heres the trick i been doing for a while now. i built myself a hydrogen fuel cell and ran hydrogen lines into my Intake. this hydrogen fuel cell is a cell that takes water H20 and splits the (H) from the 2(0). leaving you with hydrogen gas. which as a octane rating of 130 vs 91(high octane fuel). after the mixture of fuel and hydrogen you have a higher compression in your combustion chamber. leaving you using less fuel. gaining a bit more power. and a smile on your face for days. i cant specify anything but if you interested look up hydrogen fuel cells and hydrogen cars and research how they work. and if your too lazy and want a example how you could make one PM me. Viewer discretion is Advised....LOL.. haha. sorry had to post it's soo funny.....