Best and biggest tank for this kind of bike

Preface: My beloved Lola; my first build - a cheap Walmart frame with a 49cc China Doll - was stolen last week. I only had her since 04/2014.

I have since replaced her with a custom frame build that my friend's roommate has had in storage for far too long.

I will miss Lola terribly; but this new bike is just 100X better. I was already a dedicated gasbike enthusiast, but now that I see what is possible, I'm totally hooked.

SO: take a look at the pic, and let me know what I might eventually be able to upgrade to, as far as maximum tankage goes. The only limitation (and this is not a deal-breaker) is that I would like to put a standard rack on the back at some point; which may or may not keep me from using a rear-mounted tank. Open to any ideas.



Thanks everyone!

My roommate and I are wanting to take a trip from Tucson to Arivaca - roughly 60 miles - which I could likely manage with the .6 GAL tank I have right now. But what can I do if I wanna max out the amount of fuel I can carry?

Thanks for that - so far I've only for 3.5 L tanks in that style - I'll keep looking. I have seen others here and there though - and there are definitely other configurations to consider.