Some DC Fast Charging companies price their chargers by the minute and some by the kWh. Some chargers are more expensive if you use the faster chargers than if you use slower chargers. Some states require all companies to price by the minute, others allow kWh pricing. Some companies like Electrify America have memberships that reduce the price by 25-30% for only a few dollars a month.
Having done calculations comparing the cost of charging my Mustang Mach E vs a comparable small SUV, I can tell you that fueling the Mach E on the road costs around 3/4 as much as gas. I expect a Lightning will do even better vs a gas F-150.
Remember, though: most of your charging will be at home at a cost that is 1/4-1/3 the cost of gas.
Having done calculations comparing the cost of charging my Mustang Mach E vs a comparable small SUV, I can tell you that fueling the Mach E on the road costs around 3/4 as much as gas. I expect a Lightning will do even better vs a gas F-150.
Remember, though: most of your charging will be at home at a cost that is 1/4-1/3 the cost of gas.