Opinion

I recently posted in a thread on The Oil Drum about fuel efficiency standards legislation:

"In 2002 the National Academy of Sciences did a study which I think concluded that a 25% increase in fuel economy was possible using then current tech."

I'm driving a '95 Prizm. Typically this car gets 25mpg in my mixed high/city use. Simply by driving more conservatively (max 45-50mph, slow starts at lights) I can bump the mileage up by 20%. With aggressive conservation I can get 33mpg.

Thus I question the idea that it would take technology changes to make a great impact on our fuel consumption. The weakest link in automotive efficiency is the nut behind the steering wheel.

Electric utilities have discovered that immediate feedback on consumption very quickly results in voluntary individual conservation. Perhaps what is needed is not technology changes to the cars, but instrumentation changes.

Many BMW's (and other cars as well I imagine) have a button on the console that puts the vehicle into 'sport' mode where the computer adjusts shift points and fuel mixture for maximum performance. Perhaps new vehicles should be required to have a software option that places strong performance limits to assist the driver's natural impulse to drive aggressivly. This could be as simple as a 'conservation' button, much like the 'sport' button on the BMW.

Along with this would be a consumption rate meter in a conspicuous location. Perhaps as a head-up display of some sort, so that drivers are aware of it during acceleration, when their attention is typically on the traffic around them. This would help them to understand which driving behaviors consume the most fuel. The indicator would provide both a quantitative measure (cc/s) and qualitative measure (e.g., green or red light of varying intensity).

These ideas do not require any changes to the technology in the vehicles and can provide a 25 to 35 percent increase in fuel economy, driver willing. Once a driver has learned the driving habits of conservation the gains extend to other vehicles he drives as well.

So, future legislation might pick the low-hanging fruit by requiring car makers to include a performance-limiting dash switch that limits the fuel consumption of the vehicle at the users option and a short-period moving average fuel consumption rate indicator. This allows car makers to very cheaply encourage conservative behavior without requiring them to invent new technology or to significantly reduce the performance characteristics of their offerings.

As an extension auto makers might include a very simple short range wireless communication module that would allow vehicles to share their consumption information. Each vehicle would compare it's own consumption rate with that of the vehicles around it and then display to the driver his ranking. This would be designed to encourage competitive conservation. (Some people would cheat by broadcasting false signals of course, but if widely deployed cheaters would have minimal impact)

Forcing people to do things is bad mojo. Much better to coerce them.