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Not much mileage difference for the highway. I drive up north in az twice a month and in my v6 I would make it there and back and have about 1/3 of a tank left by the time I got home. I now have a cammed LS3 with 3.91's and have 1/4 tank left when I get home after the same drive. Pretty good if you asked me
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2010 Camaro 2SS/RS | 416 LS3 | FED stage 2 heads
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