hmm, that's strange, I swear I read one of my manuals stating that the CX/VX only had a 10.9 gal tank (part of their weight savings)
I'll check those sources some more because if that is the case, then I'm filling up waay too early in my VX.
Edit: Ok, so after checking the Honda Parts Catalog... It shows two completely different part numbers for the fuel tanks. It shows one that is specifically meant for the CX/VX and one for the rest of the civic models. And this is just a comparison between the hatch models. There is a third design for the 2/4 door versions as well.
Unfortunately, it doesn't show capacity on the unit.
I'm so cornfused I should just bring a spare gallon of fuel with me in my car and see just how far down I can run it as I've never put more than 9.75 gallons of gas in my VX. That was when the gas needle was below the red mark too!