Things You'll Need
Instructions
Make sure that your Ion has a manual transmission installed. This won't create a huge increase in gas mileage, but according to ACarPlace.com, it can raise the gas mileage to 26 miles gallon in the city and 33 miles per gallon on the highway.
Avoid stop-and-go driving and traffic jams. It may seem like common sense, but the smoother your driving is, with the fewer slowdowns and stops that you have, the more economical your fuel consumption will be.
Install a Saturn performance chip. These chips are meant to help increase gas mileage by a few more miles per gallon, and they're specifically designed for the Saturn engine. It's often best that you have a professional mechanic install one of these chips if you're not up to speed on how engines work because this installation isn't a simple process.