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Re: whats the LS swap mpg gains?
I have a good running 5.3, hanging on the stand....to be honest, I was not looking for a "hotrod" this trip. My old 383 gets 9-10 mpg in town, & no doubt has far more tork/power than the stock 5.3 can manage. I run OD on the hyway, but havent really checked mileage(my guess around 15mpg). For 3 -3 .5 mpg, my ? is ....can I really give up the ponies(400 hp carburated 383), vs a stock 5.3 (around 300 hp) & spend all the cash, for the fuel system,computer tune ,ect? If nothing else, I have a spare eng for my 02! I parted a wrecked 2000 GMC....when all was said /done, I had $100 in the engine /harness & all + all the extra parts for my silverado. Just fruit for thought.....how many miles would you need to run, to come even on the fuel, vs the cost? crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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