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A group that keeps tabs on toxic car chemicals has released a follow-up study showing that new cars are improving in terms of the amount of interior toxins they off-gas: What we euphemistically call "new car smell." General Motors, Mazda and Nissan showed significant improvements over the previous year, according to HealthyCar.com . The best performing vehicle this year was the Acura RDX , which scored a 0.6 on their incomprehensible 10-point scale. It wasn't all good news, as there are still many vehicles emitting that oh-so-pleasing and apparently oh-so-toxic smell. The 2009 Mitsubishi Eclipse GT Spyder tops the list of cars that still cause serious concern, though we could have told you were concerned about Eclipse GT buyers before the study. Full details and list below the jump. Acura... // Jalopnik