Cost of CNG upgrade to the CNG Cavaliers

[MichaelSmith]

Hello,

My 2000 Chevy Cavalier BiFuel CNG was totaled in a rear end collision. The offenders insurance adjuster wants to give me only the value for the purely gasoline version. Said I would need documentation to prove added value. I have called Chevy Customer service and they show the car only with a gas engine, claiming I am talking about an aftermarket addition. I do recall some one here saying these where converted by a company in Florida. Does anyone have a suggestion as to how I can show/prove to them how much extra this car would have cost because it was CNG.

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Thanks