GM Proves That Putting Holiday Decorations On Your Car Is Dumb

Holidays

Celebrating Christmas really hurts your fuel economy.

We are at the time of year when people love to decorate their homes for the holidays. Christmas lights look great on a house, but decorations seem a bit silly on a car. We have seen tons of cars driving around with those ridiculous reindeer antlers on the sides and a red nose hanging in the grille to make a car look like Rudolph. As it turns out, these decorations may have more negative side effects other than looking kind of dumb. General Motors has set out to scientifically prove these decorations are a big drag.

When we say a drag, we mean a literal aerodynamic drag. GM took its latest GMC Terrain to a wind tunnel to see how Christmas decorations impacted fuel economy. The results indicated that the reindeer antlers caused a 3% increase in aerodynamic drag at highway speeds. This translated to around a 1-mile-per-gallon decrease in fuel economy. The roof-mounted bow-tie was much worse, with a 15% drag increase an 3.5 mpg decrease in highway fuel economy. The worst offender was the roof-mounted tree, which caused a 30% decrease in highway fuel efficiency and a 70% increase in drag coefficient. GM found that the air pushed the tree with around 90 pounds of force.

You Might Also Like
10 Rarest Porsches Ever Made
10 Rarest Porsches Ever Made
10 Comfortable Coupes That Have Been Lost To Time
10 Comfortable Coupes That Have Been Lost To Time

Fortunately, most people only drive around for a short period of time with a tree on their roof because doing so can seriously effect a car's efficiency. According to the study, the grille-mounted wreath was the only decoration that didn't effect aerodynamics, but it may reduce cooling airflow to the engine. "It might be best to let Rudolph lead Santa's sleigh instead of your ride this holiday season," said Joel Ruschman, GM aero performance engineer.

Fake Lamborghini Murcielago SV Reverse-Engineered By Iran

The Chinese couldn’t have done it better.

Hennessey Trackhawk Is World's Quickest SUV

That's what a thousand horsepower will do for ya.

5 Things You Need To Know About The 2019 BMW X5

After driving the car for the first time, here are our key takeaways.

Watch The BMW M2 Competition Lap The Ring In 7:52

That was supercar territory not long ago.

Kim Jong-un Gets Classy With New Ride

So much for sanctions.

Drifting A 1,000-HP Corvette On Mountain Roads Takes Some Serious Skill

Thought drifting the entire Nurburgring was challenging? Try it in a 1,000-hp Corvette on a mountain road with no safety rails.

Hennessey Heritage Edition Ford Truck Makes More Power Than Anything You’ve Got

This crazy beast is even more powerful than the Ford GT.

Ford Imagines A Future With No Traffic Lights

Stopping at junctions could be a thing of the past in the future.

One-Off Ferrari 330GT Speciale Is A 50-Year-Old Dream Come True

This stunning coachbuilding project is a tribute to legendary Italian designer Giovanni Michelotti.

What's Hot

Related Cars

Starting MSRP
$25,000

Related Reviews

2018 GMC Terrain  Review
Model Overview
0
2018 GMC Terrain Review
2018 GMC Terrain Test Drive Review: Economies of Scale
Test Drive
18
2018 GMC Terrain Test Drive Review: Economies of Scale