Recent data show a double-digit drop in gasoline sales in Hawai'i. It's an encouraging sign, even if borne out of necessity rather than choice.

Tax collection data analyzed by The Advertiser show that Hawai'i motorists used about 14.7 percent less gas between December and April than during the same months a year earlier. A similar drop of 15 percent was recorded between November and March.

It's a drop that reflects the national trend, and it's good news. Given the likelihood of permanently higher fossil-fuel costs, changing our gas-guzzling habits is not only necessary, but has benefits that go beyond saving money.

Certainly there are collateral damages to spending less. It can be inconvenient; we drive mostly out of necessity, not as much for pleasure the way Mainland folks do, and we have fewer mass-transit options. The state also loses fuel tax revenue for roadway repairs and maintenance — about $7 million during the November-March period.

But note the benefits: Less driving means emitting fewer greenhouse gases that contribute to climate change.

Also, driving more fuel-efficient cars could reduce gas consumption as effectively as the SUV craze increased it.

But even without investing in a new hybrid, saving gas can improve Hawai'i's quality of life. Driving less may put fewer cars on the road, resulting in smoother commutes, less stress and less likelihood of accidents — which can also reduce insurance costs, a 2006 UC-Berkeley study found.

Driving moderately, not aggressively, as well as obeying the speed limit, can improve safety on Hawai'i's roads — and save up to 37 percent in gas at the same time.

Making it through this latest energy crisis won't be easy. But some solutions are within our grasp. It can be as simple as slowing down, and then making a habit of it.