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Some days I feel like slow driving, right lane, enjoy the music - not a care in the world (=Weather Mode), during those days it has been the only drives I get +22 MPG.
...and some times, well, I get less than 6 mpg (I really don't know how's that possible) - some weeks I just work for gasoline money LOL
Works great in snow as well. Drove from Cincinnati OH to Vermont, snowed the whole way back and no issues.
The only time I got nervous was in a white out, at night on an unplowed road near home with about 6" inches of snow the road that was slicker than fresh spread cow poo...it handled it and kept us from spinning out a few times. Made me a believer.