I was in Marlow last night and coming back to Twickenham. The last fuel bar was flashing in Marlow and I travelled past Bisham up to the M4, M4 to M25, M25 to M3. It was here that the M3 was blocked to London. I was forced down away from home down the M3 to junction 3 where I could then travel in the right direction back up the M3 for home. It was a bit worrying, as it was 11:30pm. I have calculated the route to be 48.5 miles. The fuel gauge on the iQ is about the only thing I don't like. I suppose it can't be any better due to the flat tank. But at least I know it does 50 mile or so on the last flashing bar.