I have posted this in a little more detail before...I just cannot remember when or where...
Make your own coffee flavoring:
Take a 30 mL bottle and fill it half full with fresh ground coffee. Whatever is your favorite. Fine ground is better than course.
Fill the rest of the bottle with plain pg. (leave a little room at the top)
Heat in microwave for 20 seconds. Let it cool down to room temp. Heat again for 20 seconds. Again cool down to room temp.
Heat again for about 5 seconds and be prepared to immediately drain the liquid into another container. I used a glass funnel and cut a paper coffee filter to fit. Prop this up, it is going to take a while to drain. After a while, clean up your mess - you will not be able to drain out all of the new coffee extract. Put a cap on the new flavoing and you are ready to make some of the best coffee flavor I ever vaped.
I used 50/50-1.2 base
add 3%- 5% coffee extract we just made
add 1% TFA Bavarian Cream
add 1% TFA Caramel
I used the 4 hour 150° crock pot steep method (& shake) and let it sit overnight.
I liked it! It also seems to get better each day.