http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/LampReplacementGuide/AutoLRG-Results.htm
not its almost like the 2057's just smaller......i just replaced mine like a month ago thats how i remembered...lol
well that can be the reason for smelling it coming out of the exhaust...but i dont think it would make your car burn any more fuel then its suppose too...could you throw up a pic of the plugs you bought??