<Cathy wrote> Can't resist the math on this one, : 60 + 10% = 66 70 + 10% = 77... So you'd be off by 10% IMHMO <end> Isn't being off a 1/10th every mile 10%? I wrote 66 at 60 and 77 at 70 also. I guess I don't understand your point. Dave