I also own a Sportster 48, and this past season I actually rode it more than my Dyna. I'm not thrilled in pulling over every 50 miles for more gas, but I got used to it.
I did not use paper money for gas. I would just ask my wife for the change at the bottom of her purse. It got to be a joke at the station I use. They told me that they never had to get coins from the bank, they just waited for me to re-fuel.
(I do have Harley's filling cuff, and I use it when I'm going to be on the slab a lot. That extra 10 miles in the tank might help me get to an off-ramp.)
https://search.harley-davidson.com/?q=fill-n-go