So now I'm going to have to subtract 5mpg from all your fuelly stats to see the real numbers you get in your hybrid as you draft all the time!! What's your average now, like 53 and climbing? I guess its really more like 48 and climbing for people who don't draft?
I know you are only kidding, but practically speaking I only draft on the FWY and I'm doing good to do it half the time. First you have to find a big vehicle going the speed you want to go and then you are lucky if they stay on the Fwy more than an hour so you end up searching again. I don't draft in the rain for obvious reasons. Wind direction/speed is the big factor on fuel economy with drafting. I have gotten 50 mpg going 80 mph driving east from El Paso for 160 mi. with 35mph tail wind, drafting may only get you 1 mpg. Your effective wind speed is only 35-45 mph. Going in reverse going 65 mph with 35 mph head wind your wind drag is 100 mph so drafting may help you by 5-6 mpg.