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Dead wrong bucko! The tire PSI on the door is what the car manufactures want you to run so you get the best ride NOT the best gas mpg. Harder tires roll easier with less resistance so there is less energy required to move the car i.e. better gas MPG.
"Overinflation" is when you inflate past the maximum sidewall tire PSI !
It's all about physics.............
Oh yes some should send your smart butt back to school..
You need to go back to school. If you inflate your tire to the pressure listed on the side wall (which is the maximum pressure) and then go on the highway, the tire will get hot and the tire pressure will go up with the temperature increase. Try going to various tire company websites for info on what pressure they recommend and you'll see it's the one on the car, not the one on the sidewall.
Well, you are losing about 2-3 gallons per tank in that car.
Just an odd thought but is it possible that someone is stealing gas from you?
That was the first thought my wife had, but it's been consistent for months now, always about the same mileage. And the "door" over the gas cap is one with a latch on it, it can only be opened by releasing the lever inside the car.
You need to go back to school. If you inflate your tire to the pressure listed on the side wall (which is the maximum pressure) and then go on the highway, the tire will get hot and the tire pressure will go up with the temperature increase. Try going to various tire company websites for info on what pressure they recommend and you'll see it's the one on the car, not the one on the sidewall.
Got a better idea. Try my way and count your gas savings at the end of the month.
Somebody mentioned running the tires at the max pressure rated on the tire, minus a couple pounds for tire heat while operating. Not based on the pressure marked on the door.
This makes no sense to me. That tire can be mounted on a 1200 lb smart car, or a 3800 lb suv. Common sense says that those two vehicles will require different tire pressures based on the weight of the vehicle, not based on what the tire says.
I don't know about tire dealers in your area, but tire dealers here will weigh your vehicle and inflate to the proper pressue based on weight so that you get the best use out of the tires (i.e. tread runs flat, but is not underinflated).
This makes no sense to me. That tire can be mounted on a 1200 lb smart car, or a 3800 lb suv. Common sense says that those two vehicles will require different tire pressures based on the weight of the vehicle, not based on what the tire says.
Common sense, there's something you don't see every day.
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