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Old 04-05-2011, 09:42 PM   #29
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2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
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Not sure what your TV is, but the "modern" stuff (last couple years) fully integrates cc with exhaust brakes, downshifts....etc. The new stuff is AWESOME!!!! Set it and forget it, HAS ARRIVED. I like to be in control, but the engineers are finally there! Trust the technology!

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Old 04-06-2011, 05:47 AM   #30
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2005 28' Classic
Port O'Connor , Republic of Texas
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Posts: 217
I've noticed that on mostly flat ground that I get better fuel milage while on cruise control. However on hills or mountian hiways , I get better milage with the cruise control off. At least that what my Duramax does loaded or empty.

2005 GMC CC D/A
2005 28' Classic
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Old 04-06-2011, 10:51 AM   #31
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2008 25' Safari FB SE
Grand Junction , Colorado
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All these stories, some of which conflict, are full of variables. The easiest for me to understand is that while we think we are keeping the gas (or diesel) pedal at a constant pressure, since we are organic, we cannot.

I've always believed that constant speed is the best for mileage, but that's ignoring things like hills. I think that really means constant rpm's. If I am driving over a series of hills on an interstate with cruise off I tend to let the vehicle slow down uphill and speed up as much as it wants downhill (unless I'm on a 5 mile downgrade and would be doing 125 at the bottom), but if I am using cruise I just let it do its thing. But, sometimes the hills are such that just about at the top, the transmission downshifts. Does that mean more gas is used? Maybe, or maybe a lower gear prevents engine lugging which may use more gas? In either event, is the difference significant enough to care?

I like cruise. It lets my leg rest and avoiding fatigue means safer driving. My concerns with cruise is that I find I keep my right foot further from the brake pedal than I would have and this must slow down my reaction time for braking. I'm told as we age, reaction time slows down, and while I haven't noticed any change, maybe I have (don't tell my wife). Maybe it takes an extra second to hit the brakes and how many feet have I traveled in that second? I also am concerned that cruise makes me less attentive, but so does fatigue.

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Old 04-06-2011, 11:01 AM   #32
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2010 30' Flying Cloud
Bakersfield , California
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Originally Posted by CrawfordGene View Post
If I am driving over a series of hills on an interstate with cruise off I tend to let the vehicle slow down uphill and speed up as much as it wants downhill (unless I'm on a 5 mile downgrade and would be doing 125 at the bottom.

Yes! Take as much of the free speed as you can while going down hills and give it back going up hills. Adds a little challenge to the drive and keeps the mind awake. I really like to keep the real-time millage screen up and try to improve my "score".
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Old 04-06-2011, 02:18 PM   #33
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Actually the cruise lets me exceed the setting going downhill. Sometimes it means driving through another vehicle and that tends to mess up the trip. Other times it means passing which may or may not be practical. I expect we've all seen trucks doing the same thing and sometimes we pass each other over and over.

I don't watch the mpg real time numbers because it means I will be driving through that guy in front of me while I obsess.

To me, the only realistic solution are vehicles with substantially better gas mileage. I hope they come soon. A proposal on future federal budgets made yesterday would eliminate all the required improvements in gas mileage and end up costing everyone a lot more someday.

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Old 04-06-2011, 05:40 PM   #34
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The real test is over multiple tanks of fuel. If the CC didn't work well, then CUMMINS, KENWORTH and the rest wouldn't recommend it's use to improve fuel mileage for professional drivers in commercial vehicles. It's harder to maintain a set speed in a big truck over any terrain, and, as CrawfordGene notes above, given time our attention flags. It's flat work to match or better the CC given easy terrain.

I always thought I could do better than any cc, especially on a turbo unit, as with the delay on the turbo, the cc tends to surge to find the sweet spot.

The programming on my '04 Dodge CTD is aggressive. But with a low cruise speed this is NOT a penalty as so little HP is being used. 24 mpg at 58-mph in coastal Texas under any conditions. Any. The CTD just flattens the few hills and rises. But I'll say again -- along with everyone else -- there are hills and then there are hills. I'm reluctant to speed over a hill not knowing what is on the other side. And some terrain doesn't lend itself to CC (not just hilly).

An '09 3500 I've driven for work is one of the fastest road vehicles I've had the pleasure of driving. High compression, integrated exhaust brake and positive shifting G56 manual transmissions in a 2WD with rack & pinion steering is spec for a little truck that can "make time" on the Texas backroads carrying hotshot oilfield deliveries. Set the CC between towns, let the EB hit at the exact moment for little town slowdowns, but ton's of power to leave at the other end. (No speeding, just using every foot of pavement: what a truck driver does that civilians don't). With some aftermarket tuning and "deletes" this thing will flat rocket around an oversized truck pulling part of a drilling rig. CC keeps things constant, what I think of as it's real benefit.

I note above that it is mentioned that passing while on CC is done. No, please don't. Dis-engage (cancel) and get around the other vehicle with more than 5-mph. In other words: No cruise control in the left lane. Ever. Passing is always chancy. Always. There is the problem of leaving it engaged and accelerating above it . . . but if something goes wrong, the throttle could catch and speed the vehicle when it isn't wanted. Sort of of locking the doors: If I do it the same way every time I never have to remember.

Fuel mileage and timeliness go hand-in-hand with safety. CC works for all three given conditions of load, road and traffic.


1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 10-cpm solo, 18-cpm towing
Sold: Silver Streak Model 3411
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