Hello, I've been using an Aspire Mini Nautilus for a while now but been finding the BVC coils can have a bit of a short life spam, and when I open them up occasionally the wire is black.. My understanding is the liquid ratio or its the sweetness caramelizing.. Over time I've also stopped turning up the voltage so much and sometimes making the air hole a bit smaller. I always make sure its not running low enough on liquid to burn out the coil..
I've used a couple of different liquids but went back to one I like..
So I've been using Vapouriz E Liquid (Black Cherry) - http://www.ubervape.co.uk/vapouriz-e-liquid-black-cherry-177-p.asp
30% VG - Vegetable Glycerin
70% PG - Propylene Glycerin
I've seen a couple of people saying 50/50 is good!? the higher the PG the worse it gets??
Anyway, whats the best e-liquid ratio for the Aspire Mini Nautilus???