I'm curious about people's utility bills. We just got ours for last month--$509.
We only heat the first floor, not the upstairs where we sleep so we heat about 2000 sq ft (400 of which is a small studio apt). 67 degrees during the day and 55 at night. Our house is an 1890's brick house with little insulation except in the ceilings.
Seems like a lot of money.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13