Some non-hybrids are scoring pretty decent fuel economy numbers (I'm consistently over 65 MPG recently) but I can understand Jason's programming problem. One possible solution would be to sample some non-hybrid cars like the VW TDI and smart fortwo cdi, write the appropriate code for them and use them as a benchmark. I could get a few other smart owners to post here if you like, to make it worth your while.
Another alternative is to go to
www.spritmonitor.de
It is a site similar to this one, but for all cars. It's in German and the consumption is metric, but they have a pretty rich database. For example, they have 850 smart cars listed (some Diesel, some gasoline), as well as VW TDIs....