Dodge Charger has Goodyear Integrity tires

Doesn't matter, manufacturers have long since not cared what kind of tires they put on their cars OEM. My Lexus came with Bridgestone Potenza RE92s, which are about the worst tire money can buy.

They come on the car because they're cheap, thats the only reason.

 

I was also surprised by this. The Integrity is also OEM on some Lexus and Acura SUVs, Cadillacs, Buicks, Chryslers, etc. I guess we aren't the only victims of the Goodyear Integrity.

The police versions of the Dodge Charger and Magnum are all sold with Continental ContiProContact tires.

 

If the Intregitys are such a piece of junk, how come changing to another type of tire will almost always result in an mpg decrease? I lost 2 mpgs by installing another type of Goodyear tire when my stock tires had it at 40,000 miles. <_<

 

<div class='quotetop'>QUOTE(Tideland Prius @ Jun 6 2006, 04:30 PM) [snapback]266942[/snapback]</div>

The Integrity is not really a LRR tire. Toyo Proxies TPT have slightly better rolling resistance than Goodyear Integrity and are a high performance tire

 

Where did you find the rolling resistance coefficient for the Toyo TPT?

 

<div class='quotetop'>QUOTE(jamarimutt @ Jun 6 2006, 06:52 PM) [snapback]266920[/snapback]</div>

I'd predict that you'd lose 1 mpg in measured mpgs if you replaced fully worn Goodyear Integrities with new otherwise identical Goodyear Integrities.

(A new OEM integrity has a diameter of 25.4 inches and 10/32 inches of tread depth. A used OEM Integrity worn down to the tread wear indicators has 2/32 inches of tread depth and a diameter of 24.9 inches. A distance that the odometer and MFD measure as 51 miles using the fully worn tires will only measure as 50 miles using the new tires. A measured fuel efficiency of 51mpg on the old tires is actually the same fuel efficiency as 50 mpg on the new tires.)

Worn tires may also have lower rolling resistance due to less tread squirm (rubber deforming and generating heat) and lower mass (less rubber slapping the road 855 times per mile). Solar and human power vehicle teams often shave tires for lower rolling resistance in competitions.

If you replaced your worn Integrities with new Integrities I wouldn't be surprised to find that your measured mpg increased by 2 mpg.

Personally I wish that I could determine the source of a 1 mpg change in my cars. With uncontrolled variables and measurment error, I routinely find that my mpg vary by 1 or 2 mpg when I'm not trying to change anything. I believe that tires have a small but important impact on fuel consumption that I would like to measure reliably.