Same thing happens with my lx570. When The driving range is down to 0 miles and I fill the tank it never holds more than 20 gallons. I haven't had the balls to keep driving past there even though I know there's another 4-5 gallons left. Once it warms up, time to push the limit.Today I ran my tank down to the point the trip computer literally said my range was 0 miles (low fuel light had been on for a long time), but when I filled up (including topping off just to see how much I could get in there) I only managed to fill 19.2 gallons. Combined with the mpgs I've been getting lately in stop and go city traffic with winter blend fuel in freezing temps, my fuel range is pretty dismal. Any ideas why I can't get more than 19 gallons in the tank even though my range is zero? Does it have something to do with really low ambient temps?