2013 Chevy Sonic sedan, 1.4t, automatic, tuned - 43.6mpg from Atlanta to Cape Hatteras, NC
Worst....
Last week. 2011 Dodge Dakota quad cab, 2WD, 4.7, automatic - 8.7mpg. Was running a test tank of E85, towing a 3000lb, 6x12 trailer and driving the shit out of it.
Worst is definitely the Briggs and Stratton engine in my power washer. I fill it up, start it up and the damned thing just sits there getting me ZERO miles per gallon. ;)
Either that or my Husqvarna riding mower. I guess it qualifies as a vehicle. ;)