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I have the V6 and run 87 oct. Some say you get less performance because of the knock sensors. Mines a DD and I have enough performance with getting 22-23 mpg ave. I don't think the added cost of the higher oct. will net me any real savings in mpg.
V8? Definately run premium.
If you do a search, there's tons of threads on this.
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2LT/RS  RJT, Blk Rally Stripes, Beige Interior, Sunroof
Placed order at dealer 4/24/09
1100 - 4/28/09
2000 - 5/01/09
2500 - 5/05/09
3000 - 5/05/09
3300 - 5/30/09
3400 - 6/05/09
3800 - 6/18/09
4000 - 6/18/09
4B00 - 6/18/09
4200 - 6/22/09
5000 - 7/01/09
6000 - 7/01/09 It's Home!!
0000 - 7/14/11 Traded in with 24,000 miles. Currently 5th Gen less
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