Buy yourself some straight PG and/or VG. Most of the prepared juices we buy have plenty of flavor and you can order pretty high nicotine levels, i.e. 24 mg/mL. Save yourself some money, buy the higher strength nicotine and dilute your juice down a little with a few drops of PG or VG. You'll notice the flavor is about the same and you'll extend your juice supply. 
Personally, I have 3-mL bottles for my juice box. I'll put in about 20-25% PG, dilute to about 3-mL with commercial juice (18 or 24 mg) and I can't really tell a difference. I'm still vaping 13-18 mg juice so I get plenty of nicotine. A real bonus is suppliers that sell 24 mg or higher juice with a double flavor option. Simply dilute it in half and you'll double your miles!
So, make sure you buy some straight PG or VG and save some $$$!
Personally, I have 3-mL bottles for my juice box. I'll put in about 20-25% PG, dilute to about 3-mL with commercial juice (18 or 24 mg) and I can't really tell a difference. I'm still vaping 13-18 mg juice so I get plenty of nicotine. A real bonus is suppliers that sell 24 mg or higher juice with a double flavor option. Simply dilute it in half and you'll double your miles!
So, make sure you buy some straight PG or VG and save some $$$!
