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Why Can't We Buy Cars That Do 60, 70, Or 80 MPG?

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2001 Honda Insight

2001 Honda Insight

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The first-generation Honda Insight hybrid, sold from 2000 through 2006, is renowned even today for its ultra-high gas mileage: 52 mpg combined (48 mpg city, 58 mpg highway).

Those ratings remain unmatched today by anything today that doesn't include a plug and a large battery pack.

So why, 15 years after the Insight went on sale--considering engineering advances made over that time--don't we have regular cars without plugs that can top those numbers?

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As the owner of a used 2001 Honda Insight hybrid--currently averaging more than 60 mpg, including a few long highway journeys at 70 mph or more--this lack of progress seems a frustrating state of affairs.

Shouldn't the modern equivalent of the Insight, 15 years later, do more like 70 or even 80 miles per gallon?

After all, it would have a cleaner-burning and more efficient engine, a more powerful electric motor, better aerodynamics, perhaps even lower weight with more advanced design of its aluminum construction material.

And given the passage of time, it would also likely be quieter, better-equipped, safer, and offer better performance.

Of course, it's not quite that simple.

Here are four reasons that we haven't (yet) seen a true successor to ultra-high-mileage cars like the original Honda Insight.

1. Cost

Making cars is never cheap. Producing a more advanced vehicle, like our hypothetical 70+ mpg gas-sipper, even less so.

It's widely known that Honda lost money on every first-gen Insight it made. That's not really surprising--not many were built, it used brand-new technology at the time, was made on a specialist production line, and was constructed from expensive aluminum rather than pile-it-high steel.

Modern car companies are less willing to experiment at a loss, so any car combining the latest fuel-saving technologies would need to make money.

That could make it quite expensive.

Okay, so by modern standards the original Insight is hardly cutting-edge. A pure modern remake probably wouldn't be that expensive--even though aluminum construction (or something more advanced, like carbon-fiber reinforced plastic) would still push up the cost.

2013 Honda CR-Z hybrid coupe [UK specification]

2013 Honda CR-Z hybrid coupe [UK specification]

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Honda's CR-Z coupe has struggled for sales at less than $20,000--and tried-and-tested hybrid system aside, it breaks no new ground either.

One factor in the CR-Z's high price is exchange rates, since it's shipped to the U.S. from Japan. Removing that factor--by producing in the U.S.--could bring costs down, but there's little incentive to built a truly niche vehicle like that on U.S. shores.

2. Practicality

The Insight, and its spiritual successor, Honda's CR-Z coupe, are both two-seater cars. While this gives the cars a sporty demeanor and a surprising amount of luggage space, it also limits their appeal to the vast majority of buyers.

Miatas, Corvettes and the like sell in relatively small numbers with two seats, but economy-biased two seaters hold even less appeal for the average car buyer.

Once again, Honda's CR-Z struggles to maintain 5,000 sales per year. Arguably, it'd do better if it was either faster or more economical (ideally both), but its two-seat layout is ultimately a compromise.

Any true Insight successor would have to have four seats, at the very least. That would make the car grow, increasing weight and frontal area, working against two attributes that make the car so efficient in the first place.


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