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February 26, 2025 — Picture a full cup of coffee balanced on your passenger seat, and drive as if you don't want to spill a drop. That simple mental trick is being promoted by a UK dealership as a way to burn less fuel — and U.S. environmental agencies say the underlying advice is sound. Aggressive driving can slash gas mileage by up to 30% on highways, according to EPA data. With fuel prices still a major household expense, experts say smoother habits are one of the fastest ways to save at the pump.
The advice comes from Dace Motor Group, a British car dealership, which urged drivers to imagine a full mug sitting on the passenger seat that must not be knocked over. In the UK, that drink is tea; in the U.S., coffee works just as well. The goal is to stop stomping on the gas pedal and slamming on the brakes, which wastes fuel on every single trip.
The dealership's point is simple: every hard stop throws away the forward momentum your engine worked to create. Rushing toward a red light, then braking hard, burns gasoline to arrive at a stop you would have reached anyway a few seconds later. Rolling gently toward the light, by contrast, uses almost no fuel at all.
Federal data backs up the common-sense advice. The Environmental Protection Agency and the Department of Energy's fueleconomy.gov website estimate that aggressive driving — speeding, rapid acceleration, and hard braking — can cut gas mileage by roughly 15% to 30% at highway speeds and 10% to 40% in stop-and-go traffic.
For a driver averaging 30 miles per gallon, a 15% mileage penalty translates into roughly 18% more fuel burned for the same distance — a difference that becomes very visible over a month of commuting. Over the course of a year, that wasted fuel can add up to several hundred dollars, depending on where and how much you drive.
The coffee cup trick works because it changes behavior without requiring any technical knowledge. A driver focused on not spilling an imaginary drink naturally:
Dace Motor Group also advised motorists to plan ahead and read the road. If traffic lights are ahead and they're red, slowing down early — rather than racing to catch them — often means the light turns green before you arrive, and you never have to come to a full stop. Since stopping and restarting uses more fuel than rolling, that's a double win.
The savings aren't just theoretical. In an eco-driving trial, staff at the AA, the UK's equivalent of AAA, cut their weekly fuel bills by an average of 10% simply by adopting smoother habits. That's roughly the equivalent of getting every tenth gallon of gas for free.
An AA spokesman put it in practical terms: "Drive smoothly, accelerate gently, and read the road ahead to avoid braking unnecessarily. Decelerate smoothly by releasing the accelerator in time, leaving the car in gear. Stopping then starting again uses more fuel than rolling. Slow early for traffic lights or approaching a queue, and you might not have to stop completely."
In the U.S., AAA has long offered similar guidance, recommending that drivers avoid jackrabbit starts, maintain steady speeds, and coast to stops whenever possible. The two organizations agree on one key point: how you drive matters just as much as what you drive.
Smooth driving also reduces wear and tear. Hard braking accelerates the wearing of brake pads and rotors, while rapid takeoffs put stress on tires and suspension parts. Drivers who adopt a gentler style typically go longer between brake jobs and tire replacements, which makes the habit as friendly to the wallet as it is to the environment.
The same principle applies to electric vehicles. Although regenerative braking recovers some energy, aggressive acceleration still drains range quickly, and stop-and-go driving hurts efficiency in any vehicle. Drivers who practice the coffee cup trick behind the wheel of an EV can often squeeze noticeably more miles out of a full battery.
No one needs to buy anything or install a device to use this tip. The coffee cup is imaginary, the fuel savings are real, and the technique can be tested on your very next drive. As EPA experts like to say, the best fuel-saving technology is a calm right foot.
