Tire PSI?

[magic1872]

Not that it make a whole lot of difference, but if I can get a few more MPG, the more the better I guess.

Ok, I have the Ohtsu 245/50/ZR16 Tires. Are they Good. (I got them Off a friend for 20 bucks for all four. He didn't want them and my factory Tires were about shot)Anyway, What would be the best tire PSI for the Best MPG right now I'm at 30-32 PSI. Last time I filled up was 9-1-02 and i got 317.7 miles out of my tank and the MPG was 22.562. Any suggestions?

[JAM]

You might want to check the PSI max rating on the side of the tire. Go a couple pounds under that, and you should be ok.

I had similar size tires before and ran them at 32 all the time. Max was 34lbs.

[kahouna23]

always check your tire pressure when the tires are cold. Obviously due to heat expansion if you check them after driving a while your pressure is going to be greater. Most performance tires are rated between 35-44lbs. My recomendation is to inflate to 34lbs COLD. Then check the tires after driving around the block. At this pressure you're tread wear is right where it should be considering that your alignment is dead on as well. Tire psi really has no effect on your gas mileage unless you're running on flats. Just my two cents

[AZ3.8Camaro]

35 PSI Warm. Anymore and you'll wear out the center of the tire any less and youll wear the edges. Especially since camaros and firebirds wear the edges on tires anyways. With more tire pressure, you do sacrifice ride quality a little. Trust me on this one, I did a LOT of research.

[TheV6Bird]

Damn, why the high numbers? I run 30 PSI cold all the way around. My tires are a bit bigger, though.

[AZ3.8Camaro]

I run 38 PSI on my 275 kumhos. The less sidewall the more air you need. You'll see why once you go through a set of tires prematurly. The numbers in the door of your car are total BS, you don't even want to know how GM comes up with them. I bet those 275s of yours are a little more worn out on the outside edge than anywhere else.

[Jack]

Actually we discussed this in an earlier post about a month ago. I e-mailed BF Goodrich and GoodYear, both of which would not go out on a limb and tell me anything definative. Both said to use the pressure recommended by the car manufacturer. It is true however that if you plus size you will need more pressure. The psi rating on the tires is the maximum pressure for a tire loaded to the max. weight rating of the tire. I do run mine at 32-35 and 35 is the psi rating on the tire, since I don't haul anything with my car other than myself this works. This got interesting with GoodYear when I mentioned to them that my Eagle RH's on my old truck have a max rating of 55 psi and at the recommended pressure on the door placard of 28 to 32 they were obviously underinflated. Never once after several e-mails would they tell me to deviate from the door placard. I guess the Firestone problem has them very gun shy.

[r&ksport]

Tires when they heat up can gain as much as 5 PSI. Remember to leave this "buffer" when you inflate your tires cold. You do not want to exceed the manufacturers' max pressure. Otherwise it may lead to premature tire faliure.