Received May 21,2016
Recently finished a trip, over 2000 miles, with the Airtabs, that I can compare quite closely to several trips made before the Airtab installation. Although I doubt the data would stand up to rigorous statistical analysis, I am quite happy with the results and my own knowledge of the weather and road conditions when comparing these trips.
I believe we got a solid 3 to 4 percent increase in gas mileage, about a half mile per gallon improvement, in the most recent trip compared to several prior trips. The trips were pretty much the same: long on interstate highways and short on city driving. When our camping club meets again this September, I will update my findings to the others who have also installed Airtabs but did not have data for comparison.
I apologize for taking nearly two years to reply; however, I wanted to make a “before and after” comparison as close as I could. As to my picture of the installation – that was a picture of the “good” side!
As I reported earlier, even without the increase in gas mileage, the handling improvement of the van in nasty winds has made the purchase, painting, and installation efforts well worth it!
Regards,
Herman