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Just looking for some gas mileage info, I have been told going with a fixed vain, my mileage will increase. Is this true? I am looking for a turbo upgrade, and want the best mileage, quick spool up , and lower egt's. I have a built trans, lift pump, intake and Efi live. My truck is my DD and I pull trailers with it every weekend, mostly 10k but sometimes 26k+. I have been looking at a 4094vvt and an s366 or s364 I think. Would appreciate some expertise.
Thanks
Casey
 

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I have the 366. No real change in mpg over stock but I added a bunch at once so who knows

I agree though if you are constantly towing that much I would wait and save up the extra grand for twins


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