Re: Sudden poor mileage and excessive rpm in Escape Hybrid
I'd take it to the dealer. There might be a TSB (technical service bulletin) issued with a fix to the problem. Otherwise going from 40 to 29mpg in winter conditions isn't bad. All the reviews I've read over the years state around 25% decrease in mileage in winter conditions. Don't forget..when the battery pack gets cold it becomes less efficient than if it was warm outside.
If you can stand it; try keeping the fan 'off' and the rear windows down a notch so the interior doesn't fog up and see if the problem persists. Driving with the fan in 'defrost' mode will also run the A/C compressor by the way, which may also explain the drop in mileage.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!