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Old 01-29-2018, 12:23 PM   #11 (permalink)
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mannydantyla's Avatar
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Location: Lawrence, Kansas
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Aerokee - '97 Jeep Cherokee XJ sport
90 day: 18.22 mpg (US)

Scrambler - '74 Honda CL200 Motorcycle
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Active air dam.. I like it! If I build a new front bumper for my jeep, this is what I'll do
- except it will be manual, I'll have to get out and lift it up when I get to the trail head. Or I'll put it down if I'm driving on the highway that day (not often)

Also, dig this: Motortrend magazine that was doing some long-term testing of the new Chevy Colorado diesel and it's 30-mpg-highway claim and they measured the mpgs with and without the air dam at city and highway speeds. Their results with the air dam off: worse fuel economy on the highway, but much better fuel economy in the city!

2016 Chevrolet Colorado Z71 Diesel Review - Long-Term Update 5

Its first test would be completely stock as delivered from the factory with the air dam affixed. Under our Real MPG cycle, our stock diesel Colorado Z71 44 achieved an impressive 21.5/31.9/25.2 Real MPG city/highway/combined. Compared to our truck’s 20/28/23 mpg EPA rating, the Real MPG results detail a 7.5 percent increase in the city, 13.9 percent increase on the highway, and an overall 9.5 percent increase on the combined cycle.

Not too shabby.

With the air dam and side steps removed, I handed the keys back to the Emissions Analytics team and eagerly awaited their results. Their testing shows that without the air dam, our Colorado Duramax 44 achieved 23.6/30.6/26.3 Real MPG city/highway/combined. Compared to the same truck with the air dam on the Real MPG cycle, that’s a 9.7 percent improvement in the city, a 4.0 percent drop on the highway, and a 4.3 percent improvement overall. Compared to the EPA, our truck—without the air dam—improves 18.0 percent in the city, 9.3 percent on the highway, and 14.3 percent on the combined cycle.
[edit] I'm digging into this a little further now and it seems that the air dam is a big topic at the coloradofans.com forums. Most people remove them because they don't like how they look (the thread "air dam is worst design ever" is 28 pages long). Several folks are reporting, however, big MPG losses with them removed. 1) My Air Dam experience MPG wise that is - Chevy Colorado & GMC Canyon 2) Air dam or not, heres some info on MPG test I did - Chevy Colorado & GMC Canyon


Last edited by mannydantyla; 01-29-2018 at 03:09 PM..
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