My whole thing is this:
The VX is a gas guzzler.
That is what it is. Like Tone said, if you want a fuel efficient vehicle, you should sell your VX and get something else. I have toyed with the idea of buying another vehicle that gets better mileage, keeping the VX for weekends, wheeling, camping, etc. But then I have another vehicle to insure and maintain, and another car payment. So I might as well just save that money and buy gas for my VX and try to baby it as much as I can. Investing a boat load of money to save money on gas is counter-productive.
Now, Moonraker, if you are saying only an inexpensive mod can save you all this money on gas, maybe there is something, but wouldn't everyone be doing it?? If there is REALLY something to this, why aren't shops across America equipping vehicles with this simple "fix" for poor efficiency? I'm not saying the whole process is a load of crap, but I do not understand why everyone wouldn't do it if it was a simple and worked as good as you say.
Also, if you ARE indeed saving money on gas, maybe you could kick in $20 of that extra cash you should now have so you can upload some photos!
Bart