vortex generators

[Overkill Fab]

well i'm new to the Yaris and this forum so I will keep it simple. Read up on the VG's and thought I would give it a try. I have a 100 mile commute everyday and want to maximize MPG.
So I had some scrap 1/2"x1/2"x1/16" angle aluminum in the shop and thought I would try that first.
http://www.yarisworld.com/forums/att...1&d=1373130395
used 3M hanger double sided tape to attach themhttp://www.yarisworld.com/forums/attachment.php?attachmentid=51285&stc=1&d=13731303 95
marked off even spaces for a total of 12 VG's.
http://www.yarisworld.com/forums/att...1&d=1373130395
used a protractor set at 18 degrees for the correct angle. Somebody correct me if i'm wrong as that's what I read is the best angle to use.
and installed them.
http://www.yarisworld.com/forums/att...1&d=1373130395
This was just a first try as I soon found out this is a bad spot as the rear hatch hits them. Also not to sure there current location is effective as its after the break for the rear hatch and I may move them forward. Also may up the size to 1"Hx2"L. but this is what I had lying around.
noticeable changes? Not really but the rear end did seem more stable when cornering at speed.