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Originally Posted by cageceo
...is it true that when the turbos are off they some how improve milage on a car ??
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Not signifcantly, although there is probably a very minor effect from swirling the air more than an n/a engine (a la
tornado).
Imo, the only related significant effect is the efficiency of running a relatively small displacement engine, which means that off-boost you get decent gas mileage (unlike a big block v8, for example)...so you get the benefits of a smaller displacement engine, and the power of a larger displacement engine at the same time.
P.S. The focus of Sam Mahdavi's interview was promoting the benefits of turbocharging, which I wholeheartedly agree with!