2011 Nissan LEAF
Automakers and consumers have been, shall we say, inconsistent in their quest for better fuel economy. When gas prices spike, fuel efficiency becomes a national priority. Politicians make speeches, carmakers trumpet their vehicles' mpg ratings instead of horsepower output and consumers flock to fuel-sipping compacts rather than gas-guzzling SUVs. But when gas gets cheap again, many people go back to their gluttonous ways. It's a vicious cycle.
There is a silver lining, though. The spikes in gas prices seem to bring about genuine bursts of innovation when it comes to fuel efficiency. As gas prices rose throughout the 2000s and then skyrocketed in 2007-2008, fuel-sippers such as the Toyota Prius went from marginal to mainstream, and automakers quickly shifted from developing one SUV after another to creating more efficient smaller cars, crossovers and hybrid vehicles.
As a result, today there is a wide selection of vehicles that deliver stellar mileage figures, ranging from the all-electric Nissan LEAF to the dual-mode hybrid Chevy Volt to the Chevy Cruze Eco, which has no hybrid system at all but manages to squeeze 42 mpg highway from a normal gasoline engine, thanks to some creative turbocharging. And even more of these misers are in the pipeline.
But before we give automakers a pat on the back for their efforts to deliver the most out of every drop of fuel their vehicles consume, it is worth looking back at the history of automobiles and asking ourselves, "Are today's cars really more fuel-efficient than they used to be?" The answer is more complicated than you might think.
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Back in the Day: A Comparison
Looking over fuel-economy statistics from the past 30 years, you'd think automakers were asleep at the wheel when it comes to fuel efficiency. For instance, a 1980 Toyota Corolla with a 1.8-liter engine had an average fuel economy of 28 mpg. A modern 2011 Corolla with a 1.8-liter engine has an EPA fuel-economy estimate of 31 mpg city and highway combined — a modest improvement of only 3 mpg.
The comparison gets even more disturbing when you consider the 1980 Dodge Colt, a 1.4-liter 4-cylinder hatchback that got up to 37 mpg combined. The closest thing Dodge sells to that today is the 2011 Caliber, a 2.0-liter hatchback that gets only 27 mpg combined.
But if you really want a humbling comparison, look at the numbers for a modern Honda CR-Z versus a 1983 Honda CR-X HF. The 2011 CR-Z has an obvious heritage that points to the CR-X. Both are 2-seat coupes with sporty handling and snazzy looks. But the modern CR-Z has two things that its predecessor did not: a continually variable transmission and a gasoline-electric hybrid engine. Those drivetrain innovations get the CR-Z a combined 37 mpg. Impressive, for sure, but still not as impressive as the 1983 CR-X HF, which posted an average fuel-economy rating of 46 mpg, with a standard 5-speed transmission and a normally aspirated 1.5-liter engine. Even if you adjust for today's EPA testing procedures, the old CR-X still got significantly more mileage out of a gallon of fuel than its modern counterpart.
Why Haven't Cars Become More Fuel-Efficient?
The most obvious reason for stagnation in fuel efficiency is economic. Low gas prices throughout the late 1980s and 1990s gave consumers little incentive to buy fuel-efficient vehicles, and thus for automakers to build them. In fact, cheap gas led to an explosion in sales of large SUVs that lasted well into the 2000s. For those who love statistics: Light trucks went from 1.2 million out of 11.9 million vehicles sold in 1979, or about 10 percent of the fleet, to a peak of 8.3 million out of 15.7 million vehicles sold in 2004 — more than 50 percent of the fleet.
Another reason is pure heft. Vehicles, even the economy cars that you'd expect to be leading the efficiency charge, are now considerably heavier than they used to be, which is in part because of attempts to make vehicles safer and more reliable. The 1980s Honda CR-X, for example, was 750 pounds lighter than the modern CR-Z.
But most experts say that the lion's share of the blame for lackluster progress in the overall fuel efficiency of an automaker's fleet of vehicles has to fall on politicians for creating weak and inconsistent Corporate Average Fuel Economy regulations.
The joint Environmental Protection Agency and Transportation Department CAFE standards program was first set in place as part of the Energy Policy and Conservation Act of 1975, after the OPEC oil embargo sparked countrywide fuel shortages and drove gas prices through the roof. The program's mandate was to reduce America's dependence on foreign oil. Congress stipulated that average fleet fuel efficiency should be targeted to the "maximum feasible level," and starting in 1978 at 18 mpg the level was supposed to rise every year. And for the first four years, it did; fleet fuel efficiency improved more than 5 mpg from 1978 to 1982.
However, after a couple of years, the exceptions started. Wary of a backlash from farmers and builders who were the traditional buyers of relatively inefficient pickups, politicians separated light trucks into a separate category, subject to weaker standards.
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