psfred,
I didn't say that rpm was bad just that a low torque peak makes it much easier to drive a tow vehicle especially when its loaded down. My experience towing with gassers and their higher torque peaks and higher revs has made this pretty obvious to me. I am also pretty sure that the IP in my old tech 6.5GM has a mechanical advance system so the timing is not fixed. These pumps have been around for years. My old tech IDI engine also manages 20-21mpg cruising at 70-75mph, 14-15mpg pulling 5-6K. Not too bad for a 6K brick IMHO. Additionally it redlines at 3600rpm but I have never needed to spin it that fast as it gets the job done fine at lower rpm. Oh yeah, AFAIK the new dmax/ps will spin to 4K no problem. I just don't get your rpm fetish. If low revs do the job, what is the advantage in higher rpm? RT

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