I know form experimentation (intentionally running the car out of gas) that with 10 gallons, my fuel gauge reads halfway between 1/2 tank and 3/4 tank. I also have a pretty good idea how much fuel is left in my tank near empty (~2 gallons) so I usually only add 8 gallons of 93 with the Torco.

I don't know why, but there are no cold start issues whatsoever with Torco. I've been meaning to log some runs with it to check on the actual timimg performance but I've had too much going on lately.