Mr. Groves,
Please correct me if any of my interpretation is incorrect.
I see that you are listed as a "New Member". There's absolutely nothing wrong with that - all are welcome here. My point is that your total cost for participation in this forum is $0 so the free advice you've gotten is in fact FREE.
You asked a question and GOT a response from several members that they either learned from years of experience or actually took the time to look up the information for you. Do you realize how rare that is?
It sounds as if you didn't like the answers you got. Oh well. Personally I put a lot of value in the information provided here. Maybe you should take a moment or two to look at the member profiles for those that you are acusing of being 'couch potatos' (one is Super Charged, one is currently building an entire aftermarket drive train, one is considered the wiki-tire-pedia).
I'm not trying to fuel the fire. I just wanted to make sure that you understand that there are no intentional efforts underway to discredit you or what you are trying to do. There have been many ... MANY ... threads here about people trying to squeeze more mpg out of a VX. If you want to reinvent the wheel however, nobody will stop you. I personally would welcome you to perform the mod you have envisioned and come back and teach us a thing or two.
Here's a starting point to help you out:
http://www.vehicross.info/forums/showthread.php?t=15864
I think he was going the opposite direction on gearing that you are planning but at least you can determine if this is something that you want to persue.
BTW, I am the couch potato you talked about. There is plenty that I would like to do to my VX. I do have the technical background and am not afraid to turn a wrench. I just don't have the time to start any large projects right now.
Last point. Good choice on the VX for a tow vehicle for JetSkis. I tow a twin pack of SeaDoos with mine (they even match the color).
Best of luck with your project. I hope you continue to be a member and let us know how it goes.
Tom