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After Mitsubishi, another Japanese automaker has admitted to using improper fuel economy testing methods. Suzuki Motors is the automaker in question. However, it stated that it was not deliberately manipulating data and it appears to be unintentional, as the company assures users “to continue use of its products at ease.”

According to the company, 16 domestic models (available in Japan only) currently on sale are affected. The 16 cars include the Suzuki Alto, Alto Lapin, Wagon R, Hustler, Spacia, Every, Carry, Jimny, Solio, Ignis, Baleno, SX4 S-Cross, Swift, Escudo 2.4, Escudo and the Jimny Sierra.

After reviewing the cars, the automaker found that instead of submitting measured data of the cars through the coasting test, it had actually submitted a build-up of measured data of individual components during rolling resistance and air resistance tests in the wind tunnel. Upon verification of adequateness, it then compared it with measured data of the car through the coasting test.

That said, after further investigations, the company believes that while there is a slight discrepancy, “all certified values remained within the range of measurement deviation,” Suzuki stated, adding, “therefore, we consider it not necessary to amend the driving resistance value applied, nor the fuel efficiency value measured using the driving resistance value.”

Suzuki also believes that the part of the issue was due to the location of its Sagara proving ground, which is situated on top of a hill, nearby a sea with weather conditions (such as wind conditions) that made testing difficult, particularly affecting the final results of the tests. Although it appears to be unintentional, the admission had caused Suzuki’s shares to drop by 11%, but it has since rebounded.