In reply to Damo:
> There really is no question here. If you are using an MSR, use white gas / Coleman fuel.
>
> Everything else is far inferior, and possibly dangerous. Price does not come into it.
Have to disagree.
I use an XPS (not a whisperlite but still MSR) and find petrol is easily the best - easy to get hold of, efficient. In a good Sigg (leave the pump in - it doesn't leak) there's no taint or other problem.
Don't tend to use it indoors so can't comment on the CO, but to suggest petrol in MSRs is dangerous is nonsense.
You can avoid the flare by only opening the valve a tiny bit when first lighting, and closing it again as soon as fuel appears on the nipple; ligting; then opening again slowly once the origianl small dose has almost burned out.
I've lit it inside a tent many times with no issue.
The worst problem was having to use diesel when I couldn't get petrol - a bugger to light.