Quote:
Originally Posted by t vago
I can also say that when I put a 25% UDP on my Dakota's engine back in 2011, I did not notice any real difference in fuel economy.
Then again, I did not (and do not) really rev the engine that much past 2000 RPM for any real length of time.
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Well yea, if your engine has a smaller rev range then a mechanical pump is naturally going to be more efficient. Smaller engines that rev 2500-3000 on the freeway have water pumps sucking down much more power.