So... your car runs on both Petrol and Propane?

So one petrol tank and one propane tank, both of which can be topped up simultaneously?
Does this mean that really, you've got a range of:- LPG: 2 X 230 miles = 460
- Petrol: ~340 miles
- Total range: ~800 miles?!

That's pretty amazing actually!

Does it sound any different running on LPG? Also, you said you haven't noticed a change in performance - what's your driving style like on the following scale?
- Calm, low revs, everything nice and easy... slow and steady gets there alive.
- Moderately enthusiastic, mid-revs often used, occasionally overtake.
- Usually in high revs, tending to push hard when the opportunity to do it sanely arises.
- Out of my way, I'm the next Michael Schumacher! Zzzzzzzzooooooooooooommmm!!!!