Dyno, we've had our 2012 Edge for over two full years now. IMHO, bottom line wrt MPG is you can't fight physics. Our FWD with 18" wheels weighs hundreds of pounds less (like 400ish?) than an AWD with 20s. I can't speak for AWD vehicles not meeting their EPA numbers, but we consistently hit our 20/27 numbers.
On a side note, DIY maintenance has been a breeze. I just finished a 30,000-mile maintenance today (my schedule) and it was easier than all my previous vehicles. Did a drain/fill twice (with a week between each drain) on coolant and ATF (to get to roughly 75% fresh), drained/filled power steering reservoir (easy to do with coolant tank removed), and did a two-year brake fluid flush the hard way (jack a single wheel, add jack stand for insurance, remove wheel, open bleeder blah blah blah), rinse and repeat 4x. Oil changes are an easy DIY as well. Relatively cheap insurance at 30,000 miles....and ready for the next 30k. Just my $0.02 FWIW....