I am looking for the best MECHANICAL modifications to improve mileage. I have a 2008 HHR Chevy with the 2.2 engine. I bought it for better gas mileage and it fits my needs perfectly in most other areas to.
My question is: What can I do mechanically to improve the mileage? My thoughts are:
1. Slightly taller tires to lower RPM. Done
2. Lower car 2 inches all the way around. Done
3. Better Cold Air Intake. Done
4. Large exhaust and muffler to get rid of restrictive stock system. Soon.
5. Underdrive pulleys. Soon.
6. Front air Dam. Done.
7. Trifecta tune to correct fuel and timing curves. Soon.
I feel that by doing these things I should be able to get better mileage and performance. Sure the driver can make more of a difference but this thread is about mechanical improvements.
Any other ideas? Thanks in advance. Curly