Check this LPG calculator. http://www.drivelpg.co.uk/savings_calculator.php
It's not really that economical on LPG either, it's about acceptable for a petrol V8 when running on gas. The petrol consumption on an S8 is just silly. If your doing mega mileage then pay the extra and get a D3 TDI IMO. Others think LPG is fantastic and rave about it, my experience put me off.
1. You won't find LPG in every station
2. You still have to fill up petrol
3. It farts and stinks after a fill up
4. Some garages won't work on it
5. If it does go wrong it will be pricey (LPG injectors, separate ECUs)*
6. It needs servicing
7. LPG gauges not accurate, you need to reset your mileage counter and go on that.
Honestly, not a fan of the stuff.
Also, I wouldn't fit it myself as some insurance companies want to see a certificate of installation which you will only get from an authorised fitter. Hopefully Mike/Nathan will be along soon to speak about their positive experience with the stuff.
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2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM
2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car
1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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