Finally got a couple of photos of the finished product (next post)
Overheating was a major issue even though the total area of the air inlets is equal to that of my square duct on
my old air dam . Probably going to replace them with a square duct like I had before.
Coastdown + MPG are improved, although this is super unscientific because I don't have any a/b/a testing except my daily numbers on my way to work.
I was able to maintain 42 mpg at 70 mph which is where I am able to cruise in very warm temps, while usually around 38-39 mpg this winter so far on road trips in the cold.
Big news, however, is that I was able to cruise in the city (60 mph limit) and keep the car in LOC (lean on cruise) much of the time, maintaining 46+ mpg with no EOC. Slightly less load on the engine may get me to be able to push this number at 70 mph in the future, so exciting...
My commutes to work appear to be a minimum of 2.5 mpg higher with the air dam on average over the past week. I saw 45 mpg a couple days for the first time in months, and 51 mpg on a return trip from an errand, so starting with a warm engine.
I can also turn on the car's heater about a minute earlier when I have 3/4 of the air inlets blocked off, so some of my 20 minute commute mpg gains are probably from faster warmup.
Looking forward to fixing the air inlet so I don't overheat and making a remote - opening door so I can maximize my MPG improvements from warmup time.
Even with the huge questionability of methods in testing here (corellation without a good control),
I am confident claiming that this mod is worth 2 mpg. Benefits are city and highway; City - warmup time + really easy coasts at 35 mph, and highway - Aero. If my methods were better, I could claim 3-4 mpg as my data suggests.
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