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Well, I hope to see the 3.9 in the GP GT model, with the 3.5 base, same goes for the Impy. Id also like to see the 3.5 go as the base engine in the LaCrosse.
Im sure that the 3.9 will also be the base engine for the Camaro, along with DOD. Id like to see DOD used a lot on the low and mid level models for the next Camaro. A 3.9 DOD car could get some near 40mpg with a 6spd, and a 5.3 with DOD could get upper 30's as well. Ive heard of Z06 owners and some fbody owners get 30mpg on there cars making over 400hp. Im sure the 3.9 and 5.3 DOD cars could gain a lot of MPG with the aid of a 6spd, and low numeric gears.
Thats some 50hp more then the .1 liter larger 4.0 V6 in the Mustang, and probably get an extra 10mpg.
 
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