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It will vary depending on your average speeds (as on any vehicle). The aero drag at 55mph is four times that at 25mph. That said, Cohen Steel (NH) is getting 2.5% -3% better mpg using 24"x30" flaps on the rear of their straight trucks. These were on 200 mile trips with loads of 5,000 - 15,000...

Gregg334, Response from my people on wet concerns: Eco-flaps should not add to the water now being indirectly whipped toward your dolly or generator box now with traditional flaps. Also, if still concerned, use them on your trailer alone. Tests show that 1/3rd of the savings benefit come from...

Our customers that have tried side fairings on the trailer have found that they negate the gains made by Eco-flaps but they don't provide as much gains and the price difference between these fairings and Eco-flaps is HUGE. It appears that it is best to let the air pass through and under the...

I will check with our other people and see if they have experience with your concerns. I do know that anything hanging on your truck that can catch air will and it can dramatically affect your mpg.

Greg, If you check on the retail price listed in an earlier post and then compare it to the pricing at my website or at Eco-flaps main site you will see that we/I offer the lowest wholesale price. The retail price is higher because the retailer needs to charge "rent" for any item they stock. If...

Nope. Nada. Nyet.

No, they are made in Chattanooga, TN by Andersen Flaps (Barry Andersen, Pres. is the inventor, his wife Rosemary is the VP). Dupont supplies the nylon resin pellets we use in the injection molding process. I forgot to mention that we ship the flaps directly to you via FedEx Ground and since the...

No, I am sorry there is not a volume discount.We do not get a volume discount from our provider, DuPont so at this time we cannot pass along any discount to our clients. Eco-flaps are made from a nylon resin product from DuPont called Zytel. It is the same material used to make truck and...

I just joined this forum today, so I'm not sure this is kosher to post this. Sorry in advance if I have stepped over the line. I am the West Coast (CA. OR. & WA) Fleet Wholesaler for Eco-flaps and I can definitely tell you they perform as advertised; no small print, italics or asteriks...