Fellow Saturn Lovers... may I have your assistance please? Planning on starting my MPG crusade with my 2002 SL1 tomorrow, 3/28/2007. I have 2 questions that I would love some info on.
1) Increase in tire air pressure appears to be an easy and effective mod. Any suggestions on tire pressure for an SL1?
2) How do I counter-act the added wear due to over-inflation? Having been a mechanic for 7 years, I know that over-inflation will wear the center out quicker. Is there an increase in PSI that won't increase the tire wear? Or should I shoot for narrower tires and higher PSI to offset?
Forget about what it says in the manual/door jam of 30front/26rear. Fill 'em up to what's printed on the sidewall? My snow tires said 35 PSI, so that's what I set them to. My Goodyear all-seasons say 44 PSI, but I put them at an even 45 PSI. I've gotten 1-2 MPG improvement with that alone on my commute to work.
I'm interested in what other Satty drivers are going with.
I'll add that the center of the tread doesn't wear as much as the edges. I've got a Discount Tire "tread gauge" card when I got tires there. 30front/26rear or even 30/30, I measured tread-depth at 7/16s on the edges. Center 8/16s. Increasing PSI should wear the center more - even with the edges. That can't be bad can it? You want the tires to wear evenly. I see so many cars with the inner and outer edges bald, with another year's tread-life on the center from under-inflation.
No Problem. Lots of this stuff has been covered before. There is a good search engine on the forum at the top that says "Search The Forum" If you have an idea just type it in there. There is still more on tire pressures if you want more info. Good luck