Jay Leno just drove the 500-mile Tesla Semi as fuel prices soar across America — and his verdict is clear. Has the death of diesel finally arrived?

But his experience comes at a moment when diesel prices (2) and operating costs (3) remain a major concern for trucking companies, and when electric alternatives are finally starting to scale.

A million-mile battery and a very different driving experience

One of the standout features of the Tesla Semi is its durability. Leno's drive highlighted the truck's long-range capability, including a battery designed to last up to 1 million miles (4).

That figure could dramatically reduce downtime, long-term maintenance and replacement costs for fleet operators and drivers — critical factors in an industry where margins (5) are often tight.

Why electric trucks are suddenly getting serious attention

Electric heavy-duty trucks have been discussed for years, but adoption has been slow until recently. The New York Times concurs (6), citing a boost in electric commercial truck ownership, but still with much room to grow.

A U.S. Department of Energy report (7) gives concrete reasons for the uptake:

• Battery costs have dropped nearly 90% since 2008, slashing the price barrier
• Early adopters report lower maintenance costs vs. diesel, thanks to fewer moving parts
• The federal government put $1.5 billion on the table to accelerate the switch
• New EPA emissions standards for 2027–2032 model years mean the clock is ticking
• Major fleets, like Amazon, FedEx and DHL, have made public electrification commitments
• Annual zero-emission truck sales grew 20-fold between 2019 and 2023

And it shows in the fact the $22.74 billion North American electric truck market is expected (8) to expand nearly three times over the next three years, according to Mordor Intelligence.

Tesla Semi program director Dan Priestley said "a few hundred" Semis were made since October 2023 and that there's "ample demand" for the vehicle, including from independent truck operators, Autoblog reports (9).

The shift is timely — it's happening as diesel costs remain volatile and putting pressure on businesses that rely on predictable fuel expenses.

The economics: Fuel savings vs. upfront costs

For trucking companies, the biggest appeal of electric vehicles isn't environmental, it's financial.

Electric trucks can offer lower fuel costs per mile than diesel vehicles, since electricity is often cheaper than traditional fuels, according (10) to the U.S. Department of Energy. They may also require less maintenance because they have fewer moving parts.

But that still might not offset the sticker price, so adoption hasn't been quick.

Electric semis like Tesla's are significantly more expensive than traditional diesel trucks, about twice as much, The New York Times reports (11). Electrek says (12) Tesla has quoted $260,000 for the 325-mile model, and $290,000 for the 500-mile model.

Infrastructure is the biggest hurdle

Even as interest grows, the transition away from diesel faces major logistical challenges.

The New York Times notes (13) that fast-charging infrastructure for heavy-duty trucks is still limited, particularly for long-haul routes that require quick, reliable charging across large distances. It's not typically feasible for long-haul drivers to spend hours recharging, so standard chargers aren't always practical.

But building that fast-charge network will take time and significant investment from both private companies and governments.

Without it, electric trucks may remain concentrated in specific regions or use cases, rather than replacing diesel across the board.

So, is diesel dead?

Not yet. But for the first time, its dominance is being seriously challenged.