I have to crank mine up as hard as I can to get it to hold on even a 10% grade in a parking lot. I like to leave it ON in neutral to prevent ICE startup (when I am just running in quickly) with the parking brake on but I don't trust it on even the slightest grade.

-Tim

2006 Mercury Mariner Hybrid AWD
Black with Pebble interior
Premium Package with Nav & Moonroof



Current ODO: 26,152
Typical Drive: 20 min crosstown in heavy traffic (3.5mi there and back twice a day)


532 Gallons of gas saved
That's 10,642 lbs less CO2 emitted