Trailer skirts,wheel covers,trailer tabs

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I have all that crap on my trailer. 0 mpg improvement. I would throw away skirts but I can't. cali regs !

 

With side wind they make worse mpg.

 

We're slowly but surely breaking the skirts off ours between plowing snow with them in the winter and crushing them backing into docks. I generally don't have the same trailer long enough to tell any difference but they seem like more trouble than they're worth.

 

I went from 8.1mpg to 8.8 mpg switching from a pretty typical 15 year old skirtless dry van on junkyard recaps to a new smartway-approved dry van with LRR tires and side skirts.


I have rubbed the skirts once backing into a dock -- since then I leave the tandems all the way forward until in the dock and haven't rubbed since. They bounced back pretty well, but I wouldn't want to be doing it all the time...

 

The upside to them is you lose the spare tire carrier so now the shop doesn't make us haul junk tires back anymore.

 

I saw a .46 increase with air tabs on truck only. Our trailers all have skirts or belly things.

 

.25 to 0.4 mpg gain after adding trailer skirts for me ...

 

My trailer skirts added about .25 to my fuel mileage. Not a lot but every little bit helps.