Just returned from a trip from Texas to Westcliffe, Ouray and Telluride, Colorado....approx 1,800 miles RT. 2010 GT 378TS.
I was surprised! If the computerized dash info system is correct, I got 7.1 mpg towing a Jeep Liberty and running the genset the whole time to provide addl A/C. It's HOT in Texas and the lowlands of Colorado this tme of year. A lot of mountains and summits to climb also..... Running at 60-65 mph when possible; pulling Monarch Pass it slowed to 35 mph.
Pete and Patty
2010 Georgetown 378TS; 2012 4dr Jeep Rubicon
1 Yellow Lab (hers);1 Little Bitty dog (mine)