Thanks for the info 2000mc! I never knew that was how the numbers worked. I just assumed that a 70R tire had the same sidewall height as all other 70R tires. So, when the day comes, and I have to get new tires, I can surely find 15" ones that have the same (or roughly the same) diameter as my stock 14's and not have to worry about the odometer or speedometer being off by very much. If i am doing this correctly then even a difference of 2% in diameter at 55mph would only throw off the speedometer by 1mph and only 2 mile for every 100 miles traveled?
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