Thanks for all the help! It's worth a million - and the check is in the mail!

These being the only differences, and me being more interested in economy than racing in this car, I'm torn between my two options.
Do I take the tranny back to the &#*@ that sold it to me? I'm compelled to do this to spite him - and carve a big 'DX' in the case so that he can't screw someone else.
Boy am I getting more cynical... what's up with people and their careless greed?? Why didn't he level with me and tell me he didn't know what tranny it was. GRRR!!!

This is why I believe in Karma - I really want to know that he's gonna get his - somehow, some way... and on this Earth.
Or do I just put up with his attempt to stick it to me and take the fuel economy?
I think I'll stick it to him.