[Fat Charlie]

Aeromods in heavy traffic?

Seriously, if you have to stay in the high 70s to keep from becoming a statistic, the surrounding traffic is your aeromod. You've got the corridor effect going on: cars in front, behind and all around. Not that it's a cure-all. I've found (in my car, on my roads, YMMV) that drafting a good 18 wheeler is good for 10 mph. That's best case- drafting behind a big rig at steady speed, I get the same mileage as I would hypermiling in open air at 10 mph less. So behind a truck at 70, I'm getting what I'd see on my own at 60.

Except your corridor isn't made by professional drivers at steady speeds, it's made by psychopaths that make it unsafe to drive more slowly. So you're not going to get optimal results from that corridor. But in traffic that heavy, I think aeromods are a waste of time.