It would have been fine, except we don't really do kitchen equipment at May Street. So my two and a half litres of soup was being transported in a 2.5l pot. You do the math. Simple division should suffice.
I set off with my 2.5L Potato & Leek G-meter. It was an eye opener. Each remotely sharp bit of braking was punished with a slap of soup onto the tray. Mighty good call on the tray. I imagine that spilling that much liquid potato would be literally the 5th or 6th worst thing you could spill in your car; beaten only by paint, motor oil, a barrel of pilchard juice or the full contents of a government officials' bladder. After a staff party.