The Cheap Car Accessory That Can Improve Fuel Economy In Hot Weather






If you live in a part of the country where sweltering temperatures are common, you’ll be all too familiar with the inconvenience of opening your car doors on a hot day and getting hit with a wave of heat. Modern cars are well insulated, and if they’re left in the sun for any length of time, they act like greenhouses and can quickly reach temperatures that make them uncomfortable to sit in. Pushing the snowflake button and turning the A/C up to maximum can help cool the cabin back down to a more pleasant temperature, but it can also have a significant effect on your car’s fuel economy.

According to the Department of Energy, leaving the A/C on full blast in very hot conditions can reduce your vehicle’s fuel economy by 25% or more. The negative effect is more pronounced on shorter trips, when you’ll spend less time in your nicely cooled car once the A/C has done its job.

The easiest way to make sure your car’s fuel economy isn’t impacted is to try and reduce the warming effect on the cabin while it’s parked. Parking under a shaded area is one way of keeping it cooler for longer, but if that isn’t an option, then a sunshade is a good alternative. This cheap accessory can make more of a difference than you might think, since reducing the temperature of the cabin by even a few degrees means the A/C has less work to do when you return to the car and drive off.

Is opening the windows more fuel efficient than using the A/C?

Sunshades are cheap and can help improve your car’s fuel economy by ensuring the cabin stays cooler, but they’re not the only way that you can reduce your A/C usage. If your car’s cabin is significantly hotter than the air outside, rolling the windows down for a short period can also be more fuel-efficient than using the A/C. It’s better to roll the windows down when you’re traveling at slower speeds, since open windows can have a more significant negative impact on a car’s aerodynamic efficiency at higher speeds.

Driving with the windows down on the highway almost inevitably means you’ll use more gas, but exactly how much more you’ll use will depend on the make and model of your car. A 2014 study by Oak Ridge National Laboratory found that a Ford Explorer only saw a drop in efficiency of between 1% and 4% when all four windows were opened, but a Toyota Corolla recorded a much higher drop in efficiency, losing 4% to 8.5%.

Using multiple methods to keep the cabin cool is the most efficient option

If your drive includes a stretch of lower-speed roads before you hit the highway, the most efficient way to cool the cabin would be to roll the windows down at first, then roll them back up and turn on the A/C when you reach the highway. It’s also a good idea to open your car’s sunroof when you’re initially trying to cool the cabin down, if your car has one. Compared to opening the windows, a sunroof usually has a much smaller negative impact on aerodynamics, and so it shouldn’t dent your car’s fuel efficiency.

It’s also worth making sure you aren’t unknowingly wasting your car’s fuel in other ways if you’re trying to keep gas bills to a minimum. Among other things, you’ll want to make sure that you remove roof racks when they’re not in use, minimize the number of unnecessary items you carry around, and make sure your tires are inflated to the correct pressure.





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If Game Two of their first-round playoff series with the Denver Nuggets saved the 2025-26 season for the Minnesota Timberwolves, Game Three showed why it should be saved. 

The Timberwolves were a different beast while decisively thumping the Nuggets, 113-96 Thursday night at Target Center, in a game that wasn’t nearly that close. These Wolves were the mythical creature we’d heard about in preseason lore, purposefully locked and loaded to be both marauding and staunch. They owned both ends of the court, gleefully transferring back and forth from irresistible force to immovable object. 

A quartet of Timberwolves deserve special mention, but it begins with Jaden McDaniels. After his team had toppled Denver to even the series at a game apiece Monday night, McDaniels used the sizable chip on his shoulder to etch some graffiti into the public discourse, casually castigating the most prominent Nuggets players by name as “bad defenders” in a matter-of-fact manner that had the media compelling him to confirm what he had just said. 

Trash talk is fleetingly fungible in the jaundiced social environment of 2026, functioning more like coupons than currency in that it needs to be rapidly leveraged before its expiration date. The common perception naturally was that McDaniels was calling out the Nuggets. But in a more subtle, profound way, he was also putting his teammates on notice. 

All season long the Timberwolves have procrastinated on their full potential, frequently demonstrating that their preseason talk about maturity and commitment was cheap. By contrast, those words uttered by McDaniels were expensive. He had just picked a fight with the opponent, leaving open the question of how many of his teammates would join him in the fray. 

That he would lead the charge was established early, after the Timberwolves’ top two scorers, Anthony Edwards and Julius Randle, had each missed a pair of open looks against Denver’s bad defenders in the game’s first 90 seconds.  

With the game still scoreless, the NBA’s best pick-and-roll combo, Nikola Jokic and Jamal Murray, were clustered around the foul line with Minnesota’s best defenders, McDaniels and Rudy Gobert. As they jammed up Jokic, McDaniels picked the ball loose and started sprint-dribbling the other way. To no one’s surprise, Donte “Ragu” DiVincenzo was also on his horse in transition, receiving a pass from McDaniels and then lobbing it back for a Jaden slam against a hapless Murray and Murray’s late-arriving teammate, Cam Johnson, who committed the foul that allowed McDaniels to finish with the “and-1” free throw. 

On the Timberwolves next offensive possession, McDaniels muscled his way to two offensive rebounds, feeding Ragu off the first one for a missed three-pointer, which he corralled for the second one and executed the putback in traffic. It was McDaniels 5, Nuggets 0, setting the tone for a game in which not only did the Wolves never trail, but never let the lead go under double digits after McDaniels made a consecutive pair of driving layups eight minutes into the game. 

“Spectacular. I thought his activity offensively in the first quarter was outstanding,” said Wolves coach Chris Finch after the game. “He was inspirational.” 

Among the most inspired were McDaniels fellow wing players, Ragu and Ayo Dosunmu. Ragu is exactly the kind of player who will have your back in a squabble, and his galvanized performance seemed borne of satisfaction that someone else had clarified the mission. As usual, the Timberwolves were at their best with him on the court: +20 in the 32:54 he played, -3 in the 15:06 he sat. 

“He makes so many hustle plays, momentum plays, different styles of plays.” Finch raved. “He’ll make a shot, get a transition bucket, he’ll rebound, get a steal, blow something up. So many different plays. He’s just a basketball player.”

Related: How the Timberwolves sparked a season-saving Game 2 comeback over the Nuggets in Denver

Then there was Ayo, whose fearless, blazing, bee-lines for the bucket were quicksilver kryptonite for a Nuggets defense that is neither swift nor rugged. “I’ve been waiting for him to wake up a little bit in this series,” Finch accurately observed. “The downhill mindset that he played with all season for us was back.”

Back with the sort of multipurpose propulsion that leaves witnesses with giddy whiplash. Ayo led the team with 25 points and 9 assists in 32 minutes of time-lapse hoops, the lone blemish being three clanks from long range. Why chuck treys when you can so easily undress players in the paint? Ayo was 10-for-12 on two-pointers and none of those dozen shots came from anywhere but beneath the rim. Five of his nine dimes likewise yielded layups or dunks, which means he personally accounted for 30 of the 68 points in the paint by the Timberwolves on Thursday, doubling up the Nuggets’ 34.

Which brings us to the non-wing in Game 3’s ring of honor, Rudy Gobert. For the third straight game, Gobert blunted the supposed advantage Denver had with the magical playmaker Nikola Jokic at the controls. Suffice to say that in the last five quarters, Jokic has shot 8-for-33 from the floor. If that continues, the Nuggets are toast in this series. 

When I asked Finch after the game if the herculean job Gobert was doing on Jokic made planning his defense simpler and better thus far, he replied, “Rudy is making all of us look good right now with his defense.” 

Amen.

If there is an asterisk on this game, it would be the absence of Denver’s brutishly versatile power forward Aaron Gordon. Nuggets coach David Adelman should be given a lot of credit for his honesty and transparency in dealing with the media during his first full season at the helm, but it came back to bite him and his team during the pregame presser, when he was clearly rattled and dejected by the sudden unavailability of Gordon, whose playing status went to “probable” to “out” in a period of a few hours due to a chronic calf strain. 

Gordon is far and away his team’s best defender, making the timing of his injury especially troublesome in the wake of McDaniels laying down his marker. Rattled is a good way to describe the entire team’s performance in the first quarter, an emotional wounding that needs to heal as fast as Gordon’s body if the Nuggets are going to be competitive in a series that had dramatically been flipped on its head over the past three days. 

That the Timberwolves played with such dominance despite mediocre outings from Ant and Randle would be a good thing for both of those current cornerstones to keep in mind. Ant was beset by foul trouble and Randle had a solid second quarter, but it stood out that neither player fully embraced what so often works on offense when the Wolves are at their best: Push the pace, move the ball, move without the ball, and make quick decisions. Ant and Randle can still be first among equals and blend into that catechism if they stay attuned to the possibilities of a greater good, one that all of sudden doesn’t have to end with them being postseason fodder for the Spurs or the Thunder. 

Not when you’ve got three wings at a collective peak, with a chaser of Rudy semi-clowning the Joker. 



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