Cruise control - Ford Powerstroke Diesel Forum
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Old 10-25-2013, 03:00 PM Rookie

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Cruise control

Hy there, I was pulling up a long hill the other day,not over loaded, just a quad and some hunting stuff. I had the truck on cruise control and noticed whenever a slight hill came up the truck would downshift into 3 rd. gear and rev to around 2800 rpm. When I turned off the cruise, the truck went immediately back into overdrive,and stayed there and it got me thinking "does the factory favour rpm over torque, do you get better fuel milage with high rpm or high torque ? or is there another reason? The truck is basically stock, K+N filter, cat. delete, a free flow muffler and 315/75-16 tires with 4.11 gears. I am sure there are much smarter people out there than me, that know about this stuff so thanks in advace, ribber
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Old 10-25-2013, 03:50 PM
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I have several gauges on my truck and can see the temperature transients on the engine when traveling on the hilly terrain where I live in the Pacific North West.

The wife and I bought a 25' travel trailer in early spring and the first few trips with it, I didn't use the Tow/Haul feature on my truck except to help slow down. I didn't know much about it and about towing. Well, I did some research on this forum and started using it and it is incredible the difference in EGT and transmission temperatures! Especially when towing the trailer over the Cascade Mountain passes mid summer when the temperatures are pushing 100 degrees outside.

It typically pulls in 5th gear at around 2200 rpm but the times I forget to turn it back on (after a pit stop), I notice it because my EGT's are about 200 degrees higher than when it is on. I also find that pulling in 5th gear seems to provide more passing power when I step on the gas.

I am no expert on towing, I just know what I know and both me and the truck like when it is in 5th gear.
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Old 10-25-2013, 06:26 PM
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I NEVER pull with cruise control. Actually I never drive with cruise at all. It's a waste of fuel. With cruise on, the PCM is telling the engine to stay at that set MPH, and take all means necasarry to do so.
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