Yesterday while going from junkyard A to junkyard B I was stuck behind two semi trucks on an offramp. Turns out one smashed into the other one and neither were moving. I pulled into the shoulder of the offramp thinking that I could turn left from the shoulder.
The light never changed. I sat there behind 3 cars for 20 minutes idling, essentially ruining any attempt to get an accurate measure of fuel economy for this tank.
What things have you guys experienced that have ruined attempts to measure your fuel economy?