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Unfortunately, those numbers used the incorrect RLHP coefficients when setting up the dynamometer. At 75 mph I’m lucky to get 36 mpg with AC off. Here’s my 2015 post on it.

Wow. Interesting stuff that. Yep. There's very definitely a sweet spot at around 50mph, and the few times I've been cruising at around that speed for a sustained period, I've my fuel economy improve markedly. Sadly, it's hard enough cruising at the posted limit most of the time, and more so when the kids are in the back ready to be at the destination yesterday ?

If you plan to use Lucas in the future I might suggest getting: 1 small bottle and 1 large container (to re-fill the small bottle) so you have the correct amount and a smaller bottle to handle with the C-Max refill port. It's almost like you need 3 hands. Odd that Lucas works well in the Focus and C-Max - must be a Ford thing. It definitely works more 'permanently' than anything else for some reason. I ended up spending a lot of money ($850 total) replacing parts (at two different garages) and the Lucas stuff fixed the CEL once and for all. Here's my 'Lucas set up' in my garage.

If you're not familiar with the Advanced Vehicle Test facility... https://avt.inl.gov/vehicle-button/2013-ford-c-max This site has tons of data on hybrids and EVs through 2014, when Congress changed hands and funding was cut and testing was dropped mid-test. Thankfully, this was part of T=0 work. Fuel Economy at Steady-State Speed, 0% Grade 15 mph 84.8 mpg 30 mph 80.1 mpg 45 mph 68.9 mpg 60 mph 50.3 mpg 75 mph 39.0 mpg Now... I never got near these numbers; low 30's at best when driving on Eco cruise control, well below 75 mph. But it gives you an idea what's achievable. Stay well, Frank

Yeah, I've been using the Engage gauge to do just that. My thing is to lift off on flat or declines if I'm going fast enough. The best I've managed is about 50mpg, and that was because there was traffic on the interstate. Most of the time I can only get between 43 and 48mpg on the highway because I can't resist going over 65mph.