My 2002 8.1 2500HD gets 10mpg empty, combined 50/50 but it is a crew cab and weighs 8200lbs with me and half a tank of gas in it. Loaded down pulling my loaded dump trailer I get about 8mpg. But it is a big block. If I take it on a long trip I get about 16mpg cruising doing about 70mph on the flats, empty of course. Last time I used it on a longer trip with a borrowed aluminum car trailer I got 11mpg combined empty/loaded for the trip. That is with no tuning or updates whatsoever. I am about to put a cat-back on because the tail pipe just relinquished it's grip on my muffler(rust) after the last short trip to town.
Here is the thing, most times I could get by running my Dakota to town and back for stuff, and that gets like 20mpg combined 50/50 as a 318 5 speed manual. The EPA said that truck is illegal to manufacture, Chrysler went to the 4.7, and then the EPA said NO and that one got discontinued ten years later.
The pure lunacy of pointing at MPG and then outlawing the manufacture of more efficient vehicles is why the subject of mandated EV's makes people upset.
As for using an EV truck, another comment above mentioned the range. Now add in -20F average in WI in January and guess what the range would be? I have yet to see anyone math out the energy consumption economics of electric vs gas or even deisel once you get a loaded range in the middle of winter down to full charge = 65 miles. Nevermind that it is simply unworkable to have a working vehicle have a 65 mile range in 99% of the landmass of the country.
Then that EV truck costs 80 grand. I could overhaul the entire drivetrain in my 2002 for under 20k. Probably under 15k, or even 12 if I had the axles rebuilt instead of replaced outright. That leaves $60,000 at the worst. Do you know how much gas I can buy for $60,000?
It is indicative of our cultures throw away society that everyone presumes they need the brand new thing and repairs are a waste of time for something even as expensive as a vehicle.
I won't even touch the costs of overhauling the drivetrain on an EV.
EV has a place in certain applications and should be researched and refined. Then, the free market should decide if those if their needs and choose what works best. However, even in this scenario, if the EPA and/or the safety police orgs are going to continue to outlaw things like my old Dakota, we will still not achieve the most efficient market available. We need to allow innovation in to design improvements to the older, light weight efficient designs or we will continue to be disappointed in the results.