Ted: Thanks very much for your input. I think I'll use 1 mph for uphill, 3 mph for downhill, and see what sort of calculations I can come up with. <br><br>Thanks also for the site you posted. It took me a while to reach it - I kept getting error messages - but I have it up now and I'll take a closer look at what it has to offer.<br><br>Again, thanks for the feedback.