Yeah, a good baseline is pretty important. A lot of times mpg tanks because of failing parts.
If you are able to work on your car halfway out of the garage in this weather, I applaud your effort. I can't even imagine Minnesota weather. 20s is plenty cold enough for me.
It may be more oranges to apples but I think that the guy has some pretty good stuff that you could do. I've been reading a bit of that thread. Some of those things are getting an air dam, synthetic fluids, gearing, and a 2.5" catback exhaust
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