You'll see premium diesel up here, but then you're trusting the station to get the mix right - which isn't too smart up here in cold weather... ...he's in his warm bed in the morning and you're 400mi away with a gelled fuel line. Start mixing at 32F. I keep it simple and go 50/50 to 10F, then straight #1. Doesn't hurt to keep a 1gal jug of #1 in the trunk just in case a filter ices up and you have to change it on the road (hint: change filter before the trip). You'll need a warm garage if the fuel lines gell up so mix as early as you can.

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daBenz - 1970 220D