Originally Posted by ocellaris
For me, seems like I get better MPG by letting the car warm up until the blue light goes out + another 30 seconds or so. This reduces the amount of time you get stuck with slug mode, and seems to burn less gas than driving on a cold engine and transmission to warm things up. My PZEV CVT car really sucks down the gas unless it is warmed up, while idling doesn't seem to burn much gas at all.
I asked that question in the general forum about if I should wait till the blue light goes off before driving off. I was told that this is bad for the engine and that I should only wait around 30 seconds or so before driving off, while keeping the rpms as low as possible.