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The great guzzler

MY 1999 100 series Toyota LandCruiser V8 must be the most uneconomical vehicle on the road. It cruises at 24 litres/100km and tows at 32 litres/100km. It has been to a few workshops without much improvement, and selling it is not viable because of market value. Should I convert it to LPG?

You could, with confidence, but it needs to be done by someone who knows what they're doing. The V8 has adjustable tappets that require setting every 40,000km as part of the service schedule, whether it's running on petrol or LPG, and it is important to keep up that maintenance. If you don't, you can get accelerated valve wear. It's also important to make sure the LPG system doesn't run lean. If it does it will run hotter and that will also increase the chances of premature valve wear, which can be even greater if the valve clearances aren't maintained. The Australian LPG Warehouse sells a vapour-injection system for the V8 LandCruiser. They spend a lot of time making sure the combustion temperature is not too high so valve wear doesn't become a problem. It's reckoned you should halve your fuel bill if you convert.

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