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Car Forum / Chevrolet / Chevrolet Malibu / January 2006unusual tire pressures and MPG
I've been maintaining the unusual tire pressures GM recommends (29 front and 26 rear) with regular rotations (every 5k mi) and I got 50k mi out of the Firestone Affinity's. I just replaced them with Goodyear TripleTred tires that I like a lot. My question is has anyone had experience or tried using the typical 34 psi that my tire shop wants to put in every car tire. I learned from Discount Tire that most Firestone Affinity tires wear thin in the center first, like mine did, even with the 29/26 psi pressures. They were suggesting that 34 psi might be better with my new tires. On a related topic, our fuel mileage has only been 25 mpg on long freeway trips, never have we got the 30 mpg I've heard others brag about. Maybe the 29/26 psi tire pressure contributes to our mediocre mileage. Thank you for any shared experience about tire pressures on Malibu's. - Duane I always run the tires at 30 psi all around. I've been maintaining the unusual tire pressures GM recommends (29 front and 26 rear) with regular rotations (every 5k mi) and I got 50k mi out of the Firestone Affinity's. I just replaced them with Goodyear TripleTred tires that I like a lot. My question is has anyone had experience or tried using the typical 34 psi that my tire shop wants to put in every car tire. I learned from Discount Tire that most Firestone Affinity tires wear thin in the center first, like mine did, even with the 29/26 psi pressures. They were suggesting that 34 psi might be better with my new tires. On a related topic, our fuel mileage has only been 25 mpg on long freeway trips, never have we got the 30 mpg I've heard others brag about. Maybe the 29/26 psi tire pressure contributes to our mediocre mileage. Thank you for any shared experience about tire pressures on Malibu's. - Duane > I've been maintaining the unusual tire pressures GM recommends (29 front > and [quoted text clipped - 16 lines] > Thank you for any shared experience about tire pressures on Malibu's. > - Duane I fill my tires to 40 PSI, also, I've noticed I get about 24 MPG on the freeway driving 70 when I slow down to 65, I get 28 MPG and when I do 55 I've gotten around 30, also I made a switch from Regular Unleaded (89 Octane I think) to Premium (92) and have gotten about a 40 mile increase in the overall tank, I reset my trip meter everytime I fill up and with 89 octane was getting about 315 to 320 Miles, with the premium fuel I'm getting about 350-360 Miles to the tank, plus it is usually better for you motor as far as keeping deposits from forming as fast. >> I've been maintaining the unusual tire pressures GM recommends (29 >> front and [quoted text clipped - 26 lines] > is usually better for you motor as far as keeping deposits from > forming as fast. Howdy Daniel G Two good reasons to use the octane rating that gives you the best milage. The cheapest gas is the gas that costs less per mile, not per gal. Sometimes they are the same, sometime not.  SignatureThrockmorton P. Ruddygore >I fill my tires to 40 PSI, also, I've noticed I get about 24 MPG on the >freeway driving 70 when I slow down to 65, I get 28 MPG and when I do 55 [quoted text clipped - 4 lines] >350-360 Miles to the tank, plus it is usually better for you motor as far as >keeping deposits from forming as fast. What year/engine do you have? Thanks over inflation of tires will result in at the least rapid wear of the center of the tread. at worst, the tire could suffer damage to the cords of the belting. also your breaking distance will be increased major amount and traction will suffer. >>I fill my tires to 40 PSI, also, I've noticed I get about 24 MPG on the >>freeway driving 70 when I slow down to 65, I get 28 MPG and when I do 55 [quoted text clipped - 12 lines] > > Thanks > over inflation of tires will result in at the least rapid wear of the > center of the tread. at worst, the tire could suffer damage to the cords > of the belting. also your breaking distance will be increased major > amount and traction will suffer. Also accelerated wear of suspension components. > I've been maintaining the unusual tire pressures GM recommends (29 front > and [quoted text clipped - 16 lines] > Thank you for any shared experience about tire pressures on Malibu's. > - Duane I've always maintained the pressure recommended by the vehicle manufacturer and I've gotten as high as 34MPG out of one tank (435 miles on that tank). Usually though it was about 31ish for road trips. City mileage, however, sucked (lucky to get 18MPG) Thank you all for your feedback. I've also done more asking around and my conclusion is to stick with the tire pressures that GM recommends on the door. Many vehicles now recommend something other than 34 psi, and their recommendations are based upon the specifics of that vehicle. Take care and drive responseably. - Duane > Thank you all for your feedback. I've also done more asking around and my > conclusion is to stick with the tire pressures that GM recommends on the [quoted text clipped - 3 lines] > Take care and drive responseably. > - Duane I'd go with the tire pressure on the tires myself, but you can do waht you feel is right ;p > > Thank you all for your feedback. I've also done more asking around and my > > conclusion is to stick with the tire pressures that GM recommends on the [quoted text clipped - 6 lines] > I'd go with the tire pressure on the tires myself, but you can do waht you > feel is right ;p The tirewall pressure is generally a maximum recommended, and is specific to the tire, regardless of the car it's on. Go with the door sticker and/or owner's manual advice as long as it doesn't exceed the tirewall number (in which case you have the WRONG tires!) >> > Thank you all for your feedback. I've also done more asking around and > my [quoted text clipped - 16 lines] > owner's manual advice as long as it doesn't exceed the tirewall number (in > which case you have the WRONG tires!) I understand this and fill my tires to 38 or 40 the maximum on the tire is 44, so i don't fill up to the max or exceed it ;p >> Thank you all for your feedback. I've also done more asking around and >> my [quoted text clipped - 7 lines] > I'd go with the tire pressure on the tires myself, but you can do waht you > feel is right ;p Do that and your suspension components will wear out quicker (excessive tire bounce, etc.) Also wet traction can be adversely impacted. > Thank you all for your feedback. I've also done more asking around and my > conclusion is to stick with the tire pressures that GM recommends on the > door. Very sage advice. The car manufacturers work closely with the tire manufacturers in determining the optimum tire pressure for each vehicle (and variant) they make. Sometimes they make mistakes as with the explorer/firestone problems of yesteryear, but they are more likely to get it right as experienced engineers than you or I are second guessing their vehicle and tire designs/characteristics. JP SignatureJP White mailto:jpwhite3@bellsouth.net |
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