As I've advised in previous blogs, adding a cold air intake to your engine is a good idea? Why? Well, ask yourself this question: do cold air intakes increase mpg? The answer is yes. But how much do cold air intakes increase mpg? That's something of an open question. What isn't open to question is the fact that cold air intakes will have a positive impact on your mileage. Why? The answer is simple: adding a cold air intake brings lower temperature air into your engine, causing it to run cooler, which means that it will run smoother and burn less fuel. Based on the research that I've done, I've learned that adding a cold air intake to a car's engine will increase the miles per gallon anywhere from three to seven or eight miles per gallon, depending on what kind of engine your car has, your own driving habits, the elevation you live at, and other factors. Depending on which brand of cold air intake you purchase, it may take a couple of years to pay for the cost of the cold air intake, but installing one should have an immediate impact on your mileage. And, with gas heading for the $4.00 a gallon mark this summer, my feeling is that everybody needs to add a cold air intake to their engine, keep their cars tuned, and keep their tires properly inflated. So the answer the question, do cold air intakes increase mpg, is yes. And with gas prices set to increase a lot over the next few years, it seems like a wise investment to me, whether you buy an aem cold air intake, a roush cold air intake, or whatever brand you favor.