ROFL ! ! !
I hope you guys got a good hardy laugh at my expense. Told you I was new to something this big. My husband told me I should read the owners manual also. So the other day when I posted this that is exactly what I had been doing. After more than one of you stated yours were just 13.0' I went back to re-read where I thought it said it was 15.7'. It appears there is a speck on the page between the 15 and 7 that should not be there. I even looked at it with a magnifying glass to make sure it wasn't a desmil. Sure enough I scratched it right off and had a good laugh myself. Feeling a bit embarshed right now.