I usually go with full tanks.. the extra weight does not effect highway mileage.. just in town economy.. but with a full tank you do not get the slosh that you do with a 1/4 full tank and that can cause problems esp if you have to make an emergency maneuver like I had to a few weeks ago..
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12