Speed control or Cruise Control

I have had several stick shift cars and every one had a cruise control. Once you get on a highway, you are in your highest gear and don't shift - so it is no different than an automatic transmission. It wouldn't be any different than an automatic, as far as having it turn off due to slower traffic or a reason to have to slow down and have the cruise kick off. The cruise kicks off with either a clutch or brake use, same as touching the brake in an automatic.  You get much better gas milage if you use the cruise.  

My big grain truck has cruise control, but I have only used it a few times.  Once when I brought it home from getting it's new box on in Nebraska and if I use it to go pick up chemical totes with a couple hours drive.  But hauling grain - never.  I am seldom on blacktop anyways, but never with a load. 

I live in the rural Midwest, so when I use my cruise control, it is for longer stretches of driving. I still use it going to town, which is not a long stretch, but about 20 miles once I get out onto the highway. I never use cruise on any gravel roads that I take to get to blacktop.

When I go out to South Dakota to cattle sales, the speed limit is 80 mph - and I run between 85-90. I find I am better off setting my cruise at 85 and not giving away any more money in SD! LOL But I am running down I-90 for about 3 hours without ever hitting the brakes! It's glorious and crushingly boring at the same time. DH is usually sound asleep, so I listen to a good book to keep me entertained.