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On my '04 Civic, I followed your lead and used the foam insulation with black duct tape holding it in.
And I did it on the bottom too.
Not too impressed with the mileage increase,
until I had to 'get going' one time.
The mileage at 65-70 mph is better than at 55,
for my mostly highway commute.
I was able to bring the mileage up from 32 to 36 by going slower and DWL,
but now it's over 40mpg with 42 not being unusual
AND driving with the crowd at 65-70 instead of granny-ing it at 55 in the right lane.
So far (here in New England) the temps haven't gone up much,
but the mileage sure has.
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