While not a normal cmax, I recently drove my energi from Alanta where I picked it up (during last weekends winter storm) and drove back to DC in mostly torrential rain and wind the whole trip in hybrid mode only. 694 miles, average was 35 mpg, heater, defroster, lights, wipers and average speed was 65 mph, where weather permitted 70-75 mph. Not great, but not bad considering the circumstances.