Yeah detroits have similar settings.

It's simple, a smaller HP engine is easier to shift at low speeds. Anyone remember the old big HP mechanicals? They were a bitch to shift.

You don't want the engine to rev 1000 rpms with a slight touch of the throttle, you want lots of feel. That's what a low HP rating gets you.

Actually on CAT's there is two adjustments you can make to the cruise. You can set the window for the desired speed and you can set the cruise to hard or soft which means on the soft setting it doesn't give it as much fuel to get back up to the desired speed.Thereby saving you money. You can set the window bigger meaning the truck has to slow down more before the criuse will accelerate it back up to speed. That also means when you go down a hill the truck will attain a higher speed before the jake will come on to slow the truck down. I think the main reason they have the split ratings is to save some wear and tear on the drivelines when in the lower gears. Especially in company trucks that might have the cheaper trans/u-joints/rear ends and drivers that think the pedal must hit the floor in every gear LOL

Yes, i know, just didn't want to be specific... :D

You can't change anything on a Volvo, just speed limits on foot and cruise, and cruise increase increments.

My engine always comes on 100% even if I'm 1 mph slower. I always use the pedal to get up to speed, never resume.

Hmm. Maybe it's my imagination, but I swear that's not the case in at least one of our trucks. This one in particular is an 1998 M11 that according to the seller, was "turned up to 410". Well we all considered that a big joke, but the other day I used the cruise (I never do) and it seems to have way, way more power in cruise than when my foot is to the floor. Alot more power. I was a mild 66,000 gross and was pulling hills in high gear on cruise that normally would have me dropping two gears and 10-15 mph.

Now I'm thinking it may be 410 on cruise.

The drivetrain longevity thing makes sense.

oops

what.....was it something i said?

Wrong! A 430/475 is 430 on the pedal, 475 on cruise. The computer controls this. Most companies that have this option are thinking a driver will use the cruise more seeing as the engine won't loose as much on a hill.

All engine makes?

Yes, that is what they all do with a dual HP rating.