That conversion kit over here sells from $300 for the cheapest one and from what I read the difference b/n the cheaper and the more expensive ones is not so much in the consumption, but rather in the car performance. If you go for the cheaper options, your car will have less torque (power?), which if you drive mostly in the city won't really make that much of a difference. I've never driven a car on NG in my life, but that's what I read on one of the local forums... also, I think every single taxi here uses natural gas.
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