I usually top off about an inch and a half short of the top. Then I manually adjust the fuel setting to 14 gal per side.
Probably having closer to 14.75 gal in each tank. This has worked well for me.
Dave Sierra Charlie- thank you very much for all the work and time (and money) you have put in to SCFLIER.COM I wish you lots of happy times with your family in Florida. We will miss you. I would like to say how happy I am that Dave is taking over the running of the site. He will do a very good job. Good luck Dave !!