The “Gas-Saving” Tricks That Could Destroy Your Car — And What Drivers Should Do Instead

Drivers looking to spend less at the gas pump sometimes turn to questionable fuel-saving tricks without considering what they could do to the vehicle. Some of these habits may save a small amount of gasoline, but they can also create unnecessary safety risks or lead to expensive repairs.

Here are some common fuel-saving tactics drivers should think twice about if they want to protect both their vehicle and their wallet.

Coasting in Neutral

One common belief is that shifting into neutral and letting the vehicle coast will save fuel. On modern vehicles, however, that isn't necessarily the case. In many situations, keeping the vehicle in gear while decelerating allows the engine management system to reduce or temporarily cut fuel delivery.

Shifting into neutral can also reduce the driver's control over the vehicle and make it harder to respond quickly to changing traffic conditions. Instead of delivering a meaningful fuel-economy benefit, the habit can create an unnecessary safety issue.

Never Using the Air Conditioner

Some drivers avoid using the air conditioner entirely in an attempt to save fuel. While running the A/C does require energy, permanently leaving the system unused isn't a smart maintenance strategy.

Automotive A/C systems rely on lubricants circulating through the system, and prolonged periods without operation can contribute to problems with seals and other components. A small amount of fuel savings isn't worth risking an expensive A/C repair.

What Actually Helps Save Gas

The most effective approach is much less complicated: accelerate smoothly, anticipate traffic, avoid unnecessary hard braking and maintain a reasonable speed. The U.S. Department of Energy says aggressive driving, including speeding, rapid acceleration and hard braking, can reduce fuel economy by roughly 15% to 30% at highway speeds and 10% to 40% in stop-and-go traffic.

Keeping your speed under control can also make a noticeable difference. Fuel economy generally drops rapidly at speeds above about 50 mph, according to the Department of Energy. Slowing down on the highway reduces aerodynamic drag and can improve fuel economy, although the exact savings depend on the vehicle, road and driving conditions.

Drivers should also remove unnecessary items from the trunk and cargo area. Extra weight requires more energy to move the vehicle, while roof racks and cargo carriers can significantly increase aerodynamic drag at highway speeds. The Department of Energy notes that roof-mounted cargo can reduce fuel economy by as much as 25% at Interstate speeds.

In other words, the easiest way to save money on gasoline isn't usually a strange trick. Smooth driving, reasonable speeds, less unnecessary weight and good vehicle maintenance can improve fuel economy without putting the car at unnecessary risk.