A lot has been said recently about the advantages of cold air intakes, but many people are left wondering: do cold air intakes increase mpg? At the same time, they may also be wondering, do cold air intakes void warranty? Is it possible to make a do it yourself cold air intake? While I'm not sure that I'd want to create a do it yourself cold air intake, my answer to the question do cold air intakes increase mpg is: Yes. To me, installing a cold air intake simply makes sense. It makes your engine run cooler and cleaner, pipes cleaner air into your car's passenger cabin, and increases your mpg. The thinking behind this is simple: when you feed your engine cool air, your engine will function more efficiently, burning fuel more efficiently, and extending the life of your engine because a cool engine will suffer less stress and less metal fatigue. So, my advice to you is to install a cold air intake on your car, whether it's a roush cold air intake, a velocity cold air intake, or whatever brand you choose. With gas prices going through the roof this summer, it will pay for itself in a very short time.