1987 300D: about to do my calculations for the past 15 or so tanks, probably will have that done by the end of the week (takes forever to enter all those receipts into Excel). I think I'm getting about 24 mpg on the last two tanks, all city (well, more like suburbs and back roads in the country ... but lots of slowing, hills, start, stop) and stretches of highway that are highly congested. Have been using ULSD, but I don't think I can blame the drop on that. Usually don't do too well in this type of weather. In December/January when we were having milder weather, I was getting around 26.5 for the same driving patterns. I haven't taken a road trip in ages ... would love to see how it does out in the open. I can remember getting 31-32 on cruising road trips.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)