Odd problem that may have been a one off. Washed car yesterday and drove for some time after. Also had it in my garage which has yet to get below freezing. Then today I am on the highway and I notice my economy needle is pegged straight down. The cruise control was even a little jerky. I figured a vacuum leak even though all my engine vacuum tubes and rubber are new. So i pull over and briefly notice a burning/foundry smell. Thinking belt I pop the hood and everything is fine. Also no vacuum hiss or smoke. Engine seems fine. I let the car idle for a while then get back onto the highway and all is well, needle never gets more than a quarter inch from left.

So my thoughts are that residual water in the brakes caused them to freeze up? And sitting allowed the ambient heat to melt the ice. I did go from garage to highway before the car engine even warmed up. Possibility? Or is this a common issues with the brake design?

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car