Less restrictive intake and exhaust really help, and often a different cam profiling can do miracles too.
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Originally Posted by wmjinman
Electric fans - not sure. I've heard they help, but I've also heard that a properly operating clutch fan doesn't take any power either, so I'm not sure on that one.
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Electric fans do really work, not just due to the overall lesser fuel consumption but they also lead to a quicker warm-up.