Reducing mpg

What ho one and all,

I have saved some episodes of a TV show and would like to burn them to DVD. Each episode is around 800,000kb and the total is too large for a DVD

using Any Video Converter, I am trying to reduce the size by a bit but all I can achieve is either enlarging each file to around 1.2gb or to a format that the quality is not so good.

How do I reduce the size by by around 20%? I don't mind a small reduction in quality, but some of my attempts are really pixelated.

Thanks

Rex