I would imagine Maverik will be pretty much just like Kum & Go, but don't know that for sure, have never been in one yet.
What might gain my interest is if the gas will be of a higher quality, 1st tier, like Conoco, Shell. Exxon, etc., or even 2nd tier. I never considered Kum & Go gas to be worth stopping for. Maybe Maverik gas will be better?
Anyway, I did some research on top tier gas. Here is the Reader's Digest version (2 links), as to which staions have good, top tier, or even 2nd tier gas:
Not all gasoline is created equal! AAA says you should look for the Top Tier logo before you fill up your tank. See the list of gas stations that sell it.
clark.com
Personally, I think many of the lesser 'brand name" gas stations tend to have lesser quality gas, not just the additves or lack thereof, but with more water content, from when refineries clean their tanks. [That appears to not always be the case.] Who gets those 1st tankers of gas after the cleaning, what is the price, etc., e.g., the lesser staions? That's what I've been told some time ago by a mechanic, not sure of the accuracy. It's funny how you hang onto bits of information, some can be true, some false.
Edit: sorry for the gas hijack, back to beer basics 201.