what type of rtt? my maggi doesn't appear to affect my mileage at all, but the soft ones are like a brick up there and will kill a couple mpgs. i was averaging 15-18 on my old 95 with 315s/488s/fully loaded, with or without rtt.
comparison trip, two 94 80s with 33s, one with a mombassa soft tent, one with a roof rack with three or four fuel cans (can't remember for sure), my 95 with maggiolina and another 95 setup the same with an arb rtt...after three days of a 9 day expedition, we roll into a town to refuel...everyone was on empty except me...i had over 1/8 tank.
comparison trip, two 94 80s with 33s, one with a mombassa soft tent, one with a roof rack with three or four fuel cans (can't remember for sure), my 95 with maggiolina and another 95 setup the same with an arb rtt...after three days of a 9 day expedition, we roll into a town to refuel...everyone was on empty except me...i had over 1/8 tank.