No doubt the 6.1 is for highway driving. And for an FWD. Fuelly rates the 2010-2014 Equinox at about 23mpg. Which probably is combined city and highway driving, and also in US gallons. Converted to L/100km, it's over 10.
If 10 is the combined number, I rather doubt the Equinox can get 6.1 on the highway.
I was worried because that's better than even the Escape Hybrid FWD, which I think is 6.7 hwy. And our AWD, which is getting 7 in summer conditions. Even though the Equinox is overall newer technology, it still shouldn't get better mileage than a similar-sized hybrid.