[Peterboat]

Would you not be better LPG? the pressures are much lower and the newer systems are very good I spent years installing them and am considering doing mine at the moment

 

[Peterboat]

CNG is much cheaper than LPG. Both are also much higher octane than gasoline, so would be well suited to a turbo.

Not in the UK CNG is virtually unobtainable LPG is under half the price of petrol and has only a small loss of MPG and with modern systems no loss of performance

 

[Peterboat]

Nice!! Here in the US LPG is significantly more expensive than petrol, but CNG at least 30% up to 50% cheaper than petrol.

I am considering converting my insight as I have kit spare, trouble is the other half's CRZ would be a better conversion I suspect, I will look into it and decide next spring when its a tad warmer