I usually tank up before going on a longer road trip. Otherwise when I come home from one. If I do enough putting around town to burn through 3/4 of a tank of gas in the summer I'll tank up there, but in winter I don't like having under a half a tank of gas so I'll tank up when it gets down to half. If I'm doing a real road trip I tend to plan ahead and make sure I have enough fuel to get to the next big center with about 100 km of range extra. I tend to drive about 5-600 km on that tank in one sitting and find that after about 6 hours in the car it feels pretty good to walk around and get fuel into it.
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