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Re: 400 rwhp and 20+ mpg?
My '71 C10 has a 5.3/4L60E, 3.73's, 29" tires, only upgrades were headers and exhaust, no tune yet, and my best was 18.5 MPG and that was all interstate miles. Normal driving it still gets 17-18 anyways. I'm sure it could do better with different rear end gears and a tune.
It doesn't make 400 rwhp (yet  ) or get 20 MPG, but it does about 5-6 MPG's better than that old 307 it had and will melt the tires off so I can't complain.
The only truck I could see realistically pulling off 400 rwhp and 20+ MPG is maybe a 4.8/5.3 in an S10...
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Zach
1970 Chevrolet Custom Camper K20
1971 GMC Super K2500, 12V/NV4500 swap in progress
1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB
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