Correct; owners manual for the VX states a 10 gal tank. With the needle deep in the red, I'm typically am putting in ~8ish gallons.
My thought with the MPGuino controlled fuel gauge was mainly to get a more accurate view of how much fuel I've actually got left. I'd still want to fill at about the same time.
Speaking of which, I filled again today, and the last tank I got
47.6 mpg. Not bad, but I'd hoped to do a little better than last time.
I think it's time to order the MPGuino, especially since they are available pre-assembled now...