You can pay Italian tolls with a credit card, but I know what you mean about feeding the gas pumps. I once thought I'd buy €5 of gas - what a waste of a stop... I think later in the day I found a gas station where I could use a CC.

On another trip I had trouble finding a working ATM on a Saturday in Antwerp. This was before the Euro switchover, and we had just arrived from Amsterdam. But the biggest problem in Antwerp was finding a pay phone.

Not sure but I think the daily ATM withdrawal limit is set by your bank. Usually it can be raised temporarily or permanently if you ask.

But that's why I prefer using credit cards as much as practical, even though even after my bank's out-of-network fee I generally get a better rate with ATMs.

I think $100 per day is about right. For a week in England I withdrew 100 pounds on arrival, then 60 pounds two days later, and then another 60 or so at the end of the week. But the only way the cash lasted that long was to use a credit card whenever possible, including Underground fares.