Maybe I just drove more aggressively with the top down...
Certainly the aerodynamics of the car suffers with the top down, but 
probably not to the degree of ~7 mpg
   Karl
>From: Bill Gunshannon <bill@cs.uofs.edu>
> >
>
>I drove my '79 Spitfire to the TRF Car Show and back.  A tank of gas
>each way.  I got 36mpg and that was with the top down. I can't see the
>top being up making all that much difference.
>
>bill
>
>--
>Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
>bill@cs.uofs.edu         |  and a sheep voting on what's for dinner.
>University of Scranton   |
>Scranton, Pennsylvania   |         #include <std.disclaimer.h>
>
 
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