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It all depends, I knwo several peopel who get 30+ out of 6 spd LS1s on teh highway, the autos get less (25-28) cause of hte added power loss, n .7 vs .5 overdrive on the highway. I've seen automatic C5s get 30-31 highway with auto or the 6spd, it all depends on the driver/car. I've talked ot a few guys with LT1s in 67-72s and they all seem ot average 20-25 highway, so 25 isnt unreasonable out of an LS1, my stock 350 will get 18mpg when its in tune....
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