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Re: Tire size vs mpg with an LS
I have a pair of MT 315/60-15 drag radials on a 15" pair of steel rims for better traction at the track, are roughly 30" tall. Taller tire to increase the footprint helps traction along with a wider one. The street tires are Nitto 275/45-17 and 29" I think? A higher speed with lower rpm is what works best for mpg... to a point. Keep your cruise rpm at or below 2000rpm and you'll typically find your best mileage. Our LS2/4L70e powered TBSS has 4.10's and 30" tire and returns 13-15avg or at 2400-2500rpm 17 or so highway mpg.
Truck never had its mpg checked. 
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Kurt -
'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...
my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken
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