[GaryBIS]

Hi,
I got a set of Vorblade vortex generators and installed them on my 2014 ProMaster van and have done an MPG test on them using the methodology described on this site.

I mounted them temporarily on the van so I could do the A-B-A thing and also not have to keep them if they did not work.


I did an A-A-B-B-A-A test with the two B's being with vortex generators. Each loop was a 65 mph drive down the freeway for 17 miles and then back in the opposite direction for 17 miles. I kept track of MPG using: 1) the onboard trip computer, 2) and OBDLink logging data to my laptop, and 3) fillups at a very nearby gas station after each two loops.

I guess I can't include links until I've made a few posts, but the full results of the test are available on my "Build A Green RV" website (just google it), then on the site search for "Vorblade". There are lots of pictures, plots, and details -- maybe someone who can post links can include the URL in a comment?

The results on the trip computer were:

First two A loops (noVGs): 21.6 and 21.1 MPG


The two B loops (with VGs): 21.1 and 20.4 MPG

The last two A loops (noVGs): 20.4 and 20.7 MPG


I can't see any reason to think the VGs resulted in any improvement.



I'd be very interested to hear...

- Any problems with the test method I used?

- Is anyone surprised by the result?

- Any suggestions for improvements?

- Any thoughts on the simpler alternate test procedure that is described at the link above?

I want to thank all the folks who contribute to the website and make it easier to come up to speed on doing valid tests easily!

Gary