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Old 03-23-2012, 05:50 PM   #1 (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
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LPG driving for Economy?

My current Car share Colleague is off to pastures new in April, So I'm landed with having to drive myself to work every day now..

To this end, for the benefit of my wallet, I have acquired a 1997 BMW 328i touring (estate) fitted with a single point LPG coversion. Car has a 5 speed Manual transmission

This has the benefit of giving me fuel at circa 0.83/Litre as opposed to 1.35/Litre for petrol.

I know I wont have the full 193 ponies available on LPG, but as its my commuting car, that doesnt matter.

I'm more interested in making it as cheap and efficient to run as possible
My route is 25 miles each way,

approx 22 miles motorway (rush our, so plenty low speed/accellerate/slow down) scenarios

3 milees town driving- fairly free flowing

At the moment, my iS returns circa 40mpg on this run- I'd like to get as close as possible- I realise I have a larger engine and LPG is inherrently worse for MPG due to lower energy content, but I do have High gearing (in relation to the iS) and more torque

Initial thoughts are similar to the iS

42psi in the tyres

P&G where possible (will it work with LG?!)

I'm open to all tips and suggestions



My Blog on cars- Fu'Gutty Cars

US MPG for my Saab 9-5 2.0t Estate

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