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Just for grins, do you remember the conversion kit manufacturer and how much it cost?

A Canadian company sells a kit for about $600, if I remember right. I set up for multi fuel a little over three years ago so I don't remember the name of the kit as I didn't buy it. I found everything I needed, except the propane/CNG tank, on ebay for under $150. You can use any propane tank but make sure it's stamped for highway use, to avoid a ticket.

Volkswagen used to sell everything you need but I couldn't find a US source. If you find a VW kit, it will work on your Audi. You can buy everything new from any fork lift supplier and still beat the Canadian kit price. The equipment is the same for any fork lift or car.

The setup for propane/cng is so easy to install you can do it in a day. The propane can be delivered into your air cleaner or you can use an injector plate under the carb. VW carbs have a propane intake built into their carbs but it requires drilling and threading and the fork lift method works well without taking the carb apart. The parts for doing either are very cheap at fork lift suppliers or simply run a hose from the solenoid , or valve, into the air cleaner intake. I used a propane valve in the beginning but a solenoid allows you to switch fuels without getting out of the car.

The alcohol is a little more complicated. You'll have to change jets for performance and mileage. I keep a spare carb setup for alcohol. Alcohol absorbs water from the atmosphere so you need to keep your alcohol tank full when the car isn't in use. I set up for alcohol only to be able to run it if there was a gas shortage.

Propane is over a dollar per gallon cheaper than gasoline where I live and I haven't noticed any difference in mileage...on a VW Bug with HV ignition. Some claim poor mileage with propane on a big V8.

The conversion to propane/cng is easier to do than reading my explanation. All simple off the shelf bolt together parts. The most difficult part of the installation is finding a spot to install the tank on a VW. You can just lay it on its side in the trunk of your Audi.
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