I was/am getting about 24 mpg at 80mph with a LS1, t56 and 3:73's on highway.
Set the rev limiter to 2400, auto, and carbon everything, and as Steve Magnate calls it "radio delete". JK of course, but not sure 30 mpg is obtainable, but maybe as light as you can go and a 4.8 or 5.3 F.I.
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Mike
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