You will not live long enough to get a payback on this.. the difference is so slight it can only be measured in a wind tunnel with high end equipment. You have to remember that magazines are out there to sell product so if they can get everyone to change over then their advertisers are happy.
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