The 2018 Ford Mustang is getting several updates, including a restyled exterior and more power under the hood. While most Mustang buyers probably don’t care too much about how fuel efficient the Mustang is, Ford has still managed to make the 2018 Mustang a tad more efficient.

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The 2018 Ford Mustang features a several aerodynamic upgrades that improves its combined mpg rating by up to 5.6 percent. The 2018 Mustang GT with its 460-hp 5.0L engine and new 10-speed automatic gets the biggest improvements with its ratings climbing by 1 mpg in the city, on the highway and in combined driving. But if you choose the six-speed manual, the 2018 Mustang GT gets the same 15/25/18 mpg rating (city/highway/combined).

The V6 engine is gone, so the base engine is now the turbocharged 2.3L four-cylinder with 310 horsepower and 350 lb-ft. of torque. If you choose the automatic, the four-cylinder is rated at 21/32/25 mpg, while the manual version is rated at 21/31/25 mpg. The combined rating of 25 mpg for both versions of the four-cylinder is 4.2 percent more efficient.

2018 Ford Mustang GT

How did Ford get make the 2018 Mustang more efficient? While testing the 2018 Mustang’s handling, Ford vehicle dynamics engineer Mike Del Zio and aerodynamics engineer Jonathan Gesek noticed that the high-speed cornering wasn’t as good as expected. Gesek decided to put a strip of duct tape over the lower part of the grille, which ended up helping the 2018 Mustang respond better in high-speed turns. That little piece of tape ended up influencing the aerodynamic design updates to the 2018 Mustang’s face.

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