i notice that i have refilled my cart 4 times on my new 510 is this normal
With a regular 510 cartridge, ymmv, depending on how much you
vape. The cartridge holds about .8ml and an average around here is about 2ml/day so I'd say you're in the 'normal range' considering you won't get the full .8ml on each 'session'.
There are mega cartridges that hold about 1.5 ml, but you have to get the matching mega atomizer. If you think you might end up with an eGo - the mega eGo cartridges w/matching atty hold 2.5ml and can last for many hours.