[NeilBlanchard]

Hi,

I made three changes between the previous summer and this last summer: the video mirrors, the smooth wheel covers and the partial front wheel skirts. My average mileage went from ~46.5mpg up to ~50.5mpg. The single best tank went from ~48.5mpg up to 53.6mpg.

So, probably what I could attribute ~1/3 - 1/2 of that to the video mirrors -- they were the most significant of the three. The smooth wheel covers were also key, with the partial wheel skirts being the least significant.

I'm trying to remember if the Kamm back panels were also in this time period -- I should look back through my own thread...

[Edit: the Kamm panels were added during the same period. I think that for my car the video mirrors added about 3% or ~1.5mpg. Which is in line with what Darin wrote at the beginning of this thread.

And believe it or not, the xA (in it's stock form) has a Cd of 0.31 -- I think the RS 2.0 version that I have is higher than that, because the grill is a lot more open. In my coastdown test (the previous summer) put my car at ~0.27, and my guess is that the current mods are maybe as low as 0.26. I was not able to do a coastdown this year, because I had a dragging rear drum brake, and now those tires are gone...]