Colonel, you will have flavor loss if you mix it with unflavored. I would buy an 11mg bottle and mix it 50/50 with the 24mg you already have. It will equal out to be 18mg without flavor loss.
I hear you...of course...Im a real spur of the moment kind of guy and I really want to vape my new liquids. Especialy the coffee.
My first non pre-filled liquid was 11mg, and it didnt really satisfy me. So I ordered the next strength up from the same vendor (24mg, dont ask me why the vendor totaly skips 18). So, in the meantime, I end up buying a Riva and get some free juice with it, all 18 mg. I ended up getting this hand delivered, so I had it before my 24mg mail order....long story short, I felt plenty buzzed from the 18 hits...then realized I bought 20ml's of 24mg nic!! haha, needless to say, I was hesitant to vape it at work for fear of getting a littel jittery.
Well, whats done is done. I'll just order the same flavors in lover strength and cut them in half. Good thing I like them.