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The best way to get good gas mileage out of any car is to keep it in tune, run clean fuel with no water(if you can find it), dont rabbit-start coming off from stops and always use overdrive on the freeway. As for the 8-6-4 caddilac systems, they sucked. The only good way to make those motors work is to convert them over to a traditional valvetrain. But as for the modern cylinder deactivation, doesnt it seem that your wasting a lot of energy moving the pistons on the deactivated cylinders. What(hypotheticly speaking) if you went with a W style engine a-la volkswagon. then, instead of shutting down just the valves, you actually freed up the cranks using a design similar to a full floating axle assembly or a hydraulic design. Then, instead of 4 active cylinders and 8 moving pistons you would have 4 active cylinders and 4 cylinders on standby. Is it Doable?
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Peace,
if you have a hot rod or classic why worry about gas mileage. you should have know with a hot rod or original motor you will get bad gas mileage. if you cant afford gas for a auto they why the hell do you have it? unless you plan on going solar power :) gas price is usualy last on thie list of a classic. and if you got it to drive it high gas prices wont really matter becasuse you will already being paying hand over fist for gas!
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57hips, I am getting used to the idea of arbitrary mileage, but I hope the combination of a low first gear and an OD fourth gear will get me over 20 mpg with a 3.55 rear and a mild SBC 350. I am just glad to get back to the forum after spending about 12 hours fooling around with anti-spyware programs and tried four different ones and managed to lose all my favorite links to parts suppliers. Well at least I can log on again and I learned a lot I didn't really want to know about my computer.
Don Shillady
Retired Scientist/teen rodder
