Two other items: light weight spare tire, as found on 90’s Mustang or 80’s turbo coupe. Lighter weight and allows for a little more space in trunk. And a lot of people neglect to have a good spare. The other is the optima battery, it is smaller than conventional battery, lasts longer. It may cost more up front but should pay for its self in the long run. Another reason to shed pounds is that to get a better horsepower to weight ratio is it canbe cheaper to go lighter to get the same result.