As an EV owner, I think you're not comparing equivalently, here. That 13 gallon tank at 30mpg (a reasonable non-hybrid ICE car) will get you 390 miles.

The Mustang Mach E is right around that average figure you cite of a 71.8kWh pack. It gets about 300 miles of highway range. That's at 100% battery. The first 10% and last 20% have to put in a lot more power compared to what you get out. It may end up being somewhat cheaper, but not as much as it looks at first glance. Depending on specific regional prices for L3 stations, you may end up spending more on an EV road trip.

Don't look at MPGe. It's a bullshit number to try to compare ICE cars with EVs, and it has so many assumptions attached that it's basically worthless.

It's not that important, though. EVs are certainly cheaper for the type of driving most people do all the time: traveling less than 20 miles per day going to work and doing errands, and then charging at home. The most common case is optimized, and even if the current relative price of L3 charging never changed, this tradeoff is worth it for most people. You'll always have a small percentage of people on discussion forums saying they want to drive 600 miles without a 20 minute stop. You'll also have a much smaller number of people who actually need to do that more than once a month, if that.