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I have 08 350 SRW auto. Got 8.1 on 2K trip in Jan, got 8.2 on 2k trip back in April. Thus us pulling a 36' about 11K trailer. Get about 11.2-.5 pulling a 4K trailer on shorter 200+ mile trip. On highway no pull Best I have gotten is 15.4 keeping the boost below 1/2 trying to stay at least 1/4, using cruise it will drop to 13-13.5 I am very happy with everything, but the mileage compared to my 2002 is about 3-5 mpg less.
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