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Thanks for the replies, was hoping for yes or no answer, rather than maybe or maybe not.
Cd - I did read that UK study, and also found some others related, but not really much detail and they were not done on a moving ground or tested in real world, so not really conclusive, but still a possibility.
Metro MPG - I will look up the Merc discussion, but about the 15 degrees being too sharp, as I understood it an overall between 12-22 degrees is suitable depending on other factors, 22 being doubtfull if other factors are not supportive. Where I say 15 degrees, I'm not talking a sharp edge 15 degrees, it would likely be about 6-8 inches transitioning from 0 - 15 degrees, so a curve leading into the straight, is this ok or have I missed something fundamental in everything I have read here.
I have put the spare back on the rear, std factory position, just looking at ways of filling & disturbing that vortex, FE is still trending down, last fill 9.87l/100km, recent average since mods began, down at 10.5l/100, average prior to mods 11.4l/100, so all still moving in the right direction.
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