HELP??I want a 1 CD film(XVCD) but the file turned to big

[dazsafc]

I read a lot of the stuff on here how yer make an XVCD so it'll fit on 1 CD.
I use 80min CDRs. Anyway Using TMGenc I followed the steps of opending a video file, loading up settings, choosing pal VCD then extra settings, and the thing that comes after. XVCD I think. I changed the VB or something to 0(automatic). Then saved the template.
I opened using the wizard chose my new XVCD template, and opened the film. I lowered the birate of video so it would fit on an 80Min CDR(99%) and left the sound at 244. Began the encoding and found the final MPeg to be 933Meg instead of just under 800meg.. Where did I go wrong??

[dazsafc]

Its OK. I didn`t change the setting to non standard Mpeg1