Thats funny, I think I am having the same exact problem.
I recently switched fuels to pure bio, which should drop the energy content and subsequently FE by around 6-10 %. Previous fuel switches haven't seen this much variation though. Well this time around I lost 4 mpg; not cool. The other day I leaned under the rear of the car to see that some of my double sided tape had let go on the rear belly pan and it could end up parachuting pretty badly at 70 mph. Just went out to the parking lot here at work and removed it, hopefully I'll get the same effect as you! I think a sturdy rear diffuser is in order now.
Awesome mileage there Neil.
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