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12/24/19 Update:
Latest tank avg was 45.7 mpg. We have had some unseasonably warm weather the past few days in WI. Some days in the afternoon into the 40s. Efficiency appears to decrease pretty sharply once below 32F. Yesterday on my way home I saw over 54 MPG over 27 miles with no tailwind in low 40s temps. Photo attached. My wife has been driving the car for errands because she likes the heated seats. She generally averages around 40 MPG, which lowers my tank averages.
The key to efficiency with this car seems to be to keep the engine out of boost as much as possible while keeping the revs low. This takes some discipline since the turbo can spool at any engine speed over 1200 rpm and provide a nice wave of torque. The temptation to tap into the boost is reduced somewhat since the car is pretty slow. There isn't much power to play even if you really thrash it.
I also ordered the front and rear wheel deflectors from a 2015 Ford C-Max new from Ford. The holes in the front of the Focus for the deflectors are not correct for the C-Max parts. A couple of the holes line up, but some modification will be required. The rears will be more involved as it appears the contour of the rocker panel is quite a bit more rounded on the focus than the C-Max. There may be one hole that can be used. The rocker covers on the Focus ST look to be flatter in that area, and might make installation easier. I am hopeful I can find a good way to attach them and looks decent. The part numbers for the C-Max deflectors I got are as follows:
RF: DM5Z-16B074-A
LF: DM5Z-16B075-A
RR: DM5Z-5811398-A
LR: DM5Z-5811398-B
I spent around $70 shipped for these parts. That would buy a lot of fuel, so it really is more about learning and seeing what can be done with the car than cost savings. I plan to keep the car for a long time, so maybe I will someday come close to breaking even... or at least that is what I will tell myself. More to come when I get some of the deflectors installed.
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