My '08 GXP V8 got 27.6 mpg on our 450 mile trip this past weekend. I've never gotten that good of gas mileage on a V8 in my lifetime, and I've owned a lot of Pontiac V8's. The response and power of the LS4 engine is amazing.
I have no interior rattles with the '08, but the suspension is very harsh when hitting potholes or sharp bumps in the road. I blame it on the 18" low profile tires, which put the rims only about 2 1/2" off the ground. There is no room for flex with tires that wide & flat.
I plan on putting some 16 or 17" tires on the car for the winter, as the 255's would not be good on Wisconsin roads on snow. Has anyone tried this on a Grand Prix GXP?
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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