[aerohead]

I messed around doing some back-of-the-envelope numbers for the Tesla pickup,bench-marked against a 2018 Ford F-150 Lariat 4X4 SuperCab,with 2.7-liter V-6 and 34-gallon fuel tank,$57,910 as tested.
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In 2012,CAR and DRIVER had done a side-by-side comparison between a Tesla Model S P85 and a BMW 528i,on a 238-mile road trip,at 65-mph steady highway driving.
The Tesla returned 90.6 mpg-e,against the bimmer,at 30.1 mpg.
This illustrates the 3-to-1 advantage of the electric powertrain over I.C.E..
Consider that if the BMW had a BSFC of 0.45-lbs gasoline/bhp-hour,then the Tesla would have an equivalent of BSFC= 0.15-lbs/bhp-hr.
Fuel cost for the BMW was $34.55
Fuel cost for the Tesla was $11.31 (and potentially carbon-free)
This is the beauty of electric vehicles.
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The December 2018 Motor Trend did a write up for an extended road test of the F-150.Their REAL MPG results were:
*18.6 MPG CITY
*23.9 MPG HWY
*20.6 MPG AVE
*11.0 MPG,towing a 6,280-lb,25-foot,Airstream Flying Cloud,at 55-MPH,to,and from the California desert.
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I gave the Tesla an identical weight and 36-sq-ft frontal area as the Ford,but cut the drag to Cd 0.29,vs Cd 0.403.
Concentrating on towing,I allowed 33-mpg towing the same trailer,at the same double-nickel speed,based on the ModelS/BMW relation.
If the Tesla was going to match the Ford's 374-miles to fuel-starvation,it would require a battery pack of 371.25 kWh.(the F-150 has a 1113.75-kWh 'pack')
This would allow a HWY range of 414-miles.
If your significant other wouldn't allow 6.8-hours on non-stop driving,then the range (and price) could be whittled down accordingly.
Tesla is aiming for Super Charger stations no more than 134-miles apart.
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In the same magazine,they had results for a 21,542-mile road test of the F-250 SuperDuty 4X4 King Ranch,with optional turbo-diesel,34-gallon tank.$78,355 as tested.
*14.9 MPG CITY actual
*22.9 MPG HWY actual
*16.1 MPG ave
*No towing data
*This engine required the diesel exhaust fluid.