Sunday, January 25, 2009


A Letter to the EPA

Drive Sensibly

Aggressive driving (speeding, rapid acceleration and braking) wastes gas. It can lower your gas mileage by 33 percent at highway speeds and by 5 percent around town. Sensible driving is also safer for you and others, so you may save more than gas money.

While technically correct, this statement is likely to be misinterpreted and lead to worse fuel economy. Rapid acceleration combined with rapid braking results in wasted gas. However, quick but smooth acceleration is more efficient than slow acceleration. Slow acceleration spends more time at less efficient vehicle speeds and at engine speeds that are less efficient while the engine is under the heavy load of acceleration. (However, accelerating too hard at low engine speed uses large amounts of gas when it is inefficient. This is why "quick, but smooth" should be emphasized.)

What is most important is that drivers remain safe and alert. Being aware of what is ahead leads not only to safer driving, but more efficient driving. Avoiding needless braking is where the fuel savings are. Being alert and getting up to speed quickly reduces the burden of congestion, but being over eager will result in waste. A driver should always be going the same speed or slower than the vehicle ahead, unless of course it is safe to go around. Accelerating too much results in unnecessary braking, and acceleration that is wasted and must be done over.

Stops are by far the biggest fuel waster. It should probably also be emphasized that encouraging communities to properly time traffic signals to reduce the amount of stops and set appropriate speed limits to keep traffic flowing smoothly will increase fuel economy better than any individual effort. When traffic lights and speed limits are set properly, driving at the posted speed will result in better fuel economy and time savings. Removing unnecessary traffic lights and stop signs should also be looked at.

Bad information has lead to declining fuel economy over past several years, despite rising fuel prices, the purchase of better fuel economy vehicles, and flat and declining amounts of driving. Adaption of moderately poor fuel economy driving behaviors resulting from bad information and price pressures are further compounded by their effect on congestion.
Dept. of Energy:
EPA, Energy Efficiency and Renewable Energy Information Center: Web Submission Form

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