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my trucks engine seems to relax a bit easier with the vacuum guage right around 60mph and at 55 it strugles just a little bit.. (less vacuum)
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It really depends. the vacuum probably goes up because of reduced pumping losses, because the throttle plate is more open. It doesn't necessarily mean it's more stressed at 55, it just means your throttle plate is more closed.
Or is it the other way around? I can't remember. someone know?