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Old 03-26-2012, 03:12 PM   #5 (permalink)
Master EcoModder
Join Date: Jun 2010
Location: scotland
Posts: 1,423

The Mistress - '88 Bmw 320i Touring SE
Team m8
Last 3: 27.17 mpg (US)

Germany Beadle - '91 Mercedes 300td (estate, N/A)
90 day: 24.63 mpg (US)

The Bloodylingo - '05 Citroen Berlingo Multispace Desire
90 day: 39.77 mpg (US)

Shanner Scaab - '03 Saab 9-5 estate Vector
90 day: 26.19 mpg (US)
Thanks: 88
Thanked 86 Times in 72 Posts
Originally Posted by Peter7307 View Post
My car is converted to run on LPG as well as the factory fitting of unleaded petrol and the general level of economy is around 10 / 15% less with gas than petrol.

The gas does vary in quality and mix and here it is possible to buy either LPG (Propane and Butane mix) or just straight Propane with no butane.

The propane and butane mix will give better economy but the 100% propane gives better starting and performance with lightly less economy.

P&G will work with lpg. I don't do it but a taxi driver I know does.

Apart from the lower costs at the forecourt there is no practical difference running on LPG and all the usual tips and tricks apply as they do to a standard petrol powered car.

The oil will last longer since there are fewer combustion byproduct deposits but LPG is more demanding on the ignition system than unleaded so good quality plugs and leads are a must.
I use NGK plugs and change the leads every 100 000 klms (about 60 000 miles) just as a precaution.

Thanks for all the info- time to check the car out and see what I have to work with
My Blog on cars- Fu'Gutty Cars

US MPG for my Saab 9-5 2.0t Estate

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