Let's compare EPA mpg and carbon footprint calculations:
Equinox FWD 2.4L 22/32 mpg (city/hwy) 7.1 tons/year CO2
Equinox AWD 2.4L 20/29 mpg 8.0 t/yr CO2
Escape Hybrid FWD 34/31mpg 5.7 t/yr CO2
Escape Hybrid AWD 30/27mpg 6.3 t/yr CO2
Saturn Vue Hybrid 25/32 mpg 6.6 t/yr CO2
So Equinox "trounces" the hybrid Escape because it beats it on highway fuel economy by a whopping 1-2mpg? And it doesn't even trounce the Saturn Vue Greenline, soon to be killed off.
Where the Equinox does beat the Escape is in acceleration:
Equinox FWD 2.4L 8.7s (GM claim)
Escape Hybrid FWD 9.5+ s (Edmunds)
Which is impressive, considering that the Equinox weights about 100lbs more than the Escape, 3761 vs. 3669 lbs.