Maybe not the big players, but local mom and pop stations here in the Bay Area most definitely still offer a "cash discount" typically to the tune of 8-10 cents per gallon.
ARCO who typically has the lowest price on the block, also only takes debit or cash, and charges a $0.35 processing fee even for using debit.
Honestly when you do the math, unless gas is <$2 per gallon, you still come out ahead using a 5% cash back gas card and not taking the cash discount.
Since California has the second highest gas prices in the nation, I've never once bothered with the cash discount. I get anywhere from 3.75% to 4.5% cash back paying gas with my BoA cash rewards, and it's always cheaper to use credit.
Bonus: BoA CR gives 2% back at grocery stores. Well my local grocery store carries ARCO prepaid gas cards that I can use at their pumps without incurring the $0.35 debit fee. So I'm effectively getting 2% CB on an already lowest-around-block gas price. Win-win. 
(for context ARCO is BP's "discount brand" that only takes cash or debit with a $0.35 flat fee in exchange for unbeatably low gas prices)
In Milwaukee, most of the major brand stations show a cash price for regular unleaded, a credit price for same, and either a milk or cigarette price on their digital signs.
@Anonymouswrote:People need to see why cashless restaurants should be accepted in our society.
I'm interpreting this as a thread where many see an issue with cashless restaurants, but turn around and praise cash only restaurants. As society itself moves towards liquidated (or digital) cash, mobile wallets to pay their friends, and even mobile wallets to use their "card," I don't see an issue with cashless restaurants. I do feel as if people who try to drill the cash only mindset into others are more guilty of trying to make people adopt to their ways rather than the other way around. Business owners shouldn't expect people to carry cash in what is now considered a predominately digital society. If I'm unfamiliar with an establishment, I (and most others) expect to be able to use their card.
All I'm saying is that I can understand and completely see where 100% cashless restaurants are coming from. Another perks of going cashless? The networks may offer you a significantly lower interchange fee rate.
To clarify, I'm not meaning to "praise" cash only businesses. I simply don't have any problem with them and don't understand why it was implied that cash-only means the owner is dishonest.
One person may think it's weird to carry any cash ever, but I think it's weird to have NO cash ever. Besides the question of what do you do when some car accident or pole fire takes out the internet and renders a business unable to access their payment servicer (rare, but happens two or three times a year), but I always offer to leave a cash tip (better for the server), and pay cash with small purchases, as there's usually a minimum transaction fee the merchant is charged.
Again, to reach their own. It's not a hardship for me to carry $50 in my wallet.
I have no problem with it i go months and months with out ever seeing cash money
