Even if you have the most gas efficient car on the road, the truth of the matter is: the faster you go, the more miles per gallon you burn. This is especially true at the higher speeds. Going 65 burns less than 70, which in turn burns a whole lot less than 75. Going the speed limit can actually save you money on gas! This little tip can also save you on speeding tickets, and keeping THOSE off of your record can save on your car insurance.