It should be noted that if…
It should be noted that if you're driving through Rochester, WA, you almost certainly aren't paying $3.50/gallon for gas. Going rate for gas appears to be around $4 per gallon there, and if you're coming from Seattle or Tacoma it is higher yet.
Conversely, if you're charging at home in that area, your cost for electricity is around 13 cents/kWh, substantially less than the national average.
Finally, I'm skeptical that anyone is getting 22 MPG in an F150.
But the bottom line is that savings on fueling costs for an EV really do assume that you're normally able to charge at home.