The light comes on somewhere between the school pickup and the turn toward Mom's street. Nobody in the car says anything, because everyone assumes somebody else filled up last. That is how one car runs out of gas in a family with two houses and two rows.

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Who fills the tank on which row

In a split week the car changes hands more often than the calendar does. It leaves the kids' house with a full day ahead, goes to school, to practice, back to Mom's for the afternoon window, and sometimes back to the kids' house for dinner. Every leg burns fuel, and no leg is labeled as the one that refills it. Before you decide anything, write down the last three fill-ups: the date, who did it, and which row they were on. If you cannot name a person for each one, you have found the gap.

Make the gauge part of the handoff

Treat the fuel needle the way you treat the car seat or the lunch bag. When the car changes rows, whoever is handing it over glances at the gauge and says it out loud, even if the answer is just "half." It takes two seconds and saves you a missed pickup and a phone call from the side of the road.

Know the two or three stations on the route

Pick the stations you would actually use on the way between the houses, and check a few things before you need them. Is the station on the side of the road you drive in the morning? Can you reach the pump without unbuckling the kids? Is there one on the way home from the afternoon window, when you will be most tired? Compare only what matters to your route, not brands or who has the cheapest pump on a given day.

Find the warning line and write it down

Look up where your car's low-fuel warning sits on the gauge and what the trip display says about miles left. Then write that number on a card that lives in the car and a second copy on the fridge at each house. When both houses know the same number, the light stops being a surprise.

When the light comes on

Do not wait for the next row to fix it. Whoever sees the light first takes the car to the nearest station, even if it is out of the way, and then posts a short note in the shared place: filled up, on this row, at this time. After that, talk about who owns the next fill, not who was supposed to do the last one. If the same person keeps ending up at the pump, say so out loud and trade them a different job. A gas light is a logistics problem, not a verdict on anyone in your family.

If you keep both rows on one page, the setup in The Kids' Week and Mom's Week is a good place to add a fuel line next to the rides.