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Boy I would have a hard time believing a hemi getting 26 mpg too. IF that whole cylinder reduction technology worked at all, it may be possible, but hemi's are certainly not know fo their mpg.
I have been around longer than most of you (except for a few) and have spent my whole life around things where a good bs filter is required. The trucking industry is one where the power, mileage, trip times,and dollars/mile need to be scrutinized.
I farm, and yields, acres/hour, bushels/hour are always inflated so filtration is required.
The other, especially in time of high fuel prices, is mileage. Claims are just hot air - my F350 is capable of 20 if driven by a little old lady. Real mileage is the same load, the same day, and making the same time ---> anything else is just using up good quality air and an ego stroke for the teller of the tale!
Comparissons must be on a level playing field to be credible - the 'I heard a guy tell a buddy's cousin' stories are cute and entertaing ( just like a Disney fairy tale!!)
just telling it like i see it... my partner for work has an '00 chebby with the 5.3 and he might get 19 with a tailwind... regular cab truck, 4wd. we do some installs for another guy with an '08 chevy crew cab 4wd, 5.3 with the multi-displacement system and he's highly dissapointed in the 19-20 that he's getting with 7000+ kms on the truck... i'm getting 19mpg already with only 1500kms on mine, mostly city driving... i don't spread BS, there's no point to it. sure i haven't been on this earth as long as some, but i'm wise beyond my years and feel confident in saying it.
just for S&G, for what its worth, my mother had a '00 chevy ext cab 4x4 with the 4.8... it would consistantly pull 26mpg on the highway on a calm day... be interesting to see how it does in the '08 she has.
the 4.8 is a v8. not a bad little engine for a chebby. sure beat the tar out of the 305 it replaced. as i've said before, my 4.6 got good mileage too...
ANYTHING is better then a 305, thats gotta be one of the weakest engines. The best thing ever about owning a 305, is you could very very easily swap a 350 in its place.
I had two 305 engines - my first and last (it was the same engine!). It was gutless and if you hauled more than a bottle of pop and a bag of chips it got worse mileage than a 350!