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      04-30-2021, 07:40 AM   #42
Desertnate
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Drives: BMW 435i
Join Date: Jul 2019
Location: Swansea, IL

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2016 BMW 435i  [0.00]
Quote:
Originally Posted by CajunBMW View Post
I will add on long haul highways in Louisiana and Texas at 80-85+ mph I found no savings in eco vs comfort, at least as measured by the bmw mpg values in idrive. I do note a bit better mpg at lower speeds on local highways.
This has been my experience too when bombing across the mid-west US. At any speeds above about 75, it provides no value when checking my gas mileage by hand not OBC/display. In the summer not only does it not save you any fuel at those speeds, but it also lowers the performance of the A/C and won't keep the car cool.

I do use it on a flat and straight portion of highway to my daughter's college. Speeds along a 1.5 hour stretch of the road stay around 70~75mph due to traffic and a heavy Highway Patrol presence. The best approach is just to set the cruise control at 75, drop the car into eco-pro (when it isn't really hot and sunny), and just glide along.
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