I understand about the disparity between the advertised life expectancy and energy efficiency on the packages and real life use. But then I’m always suspicious of any advertized claims including the MPG ratings on car stickers. But in the case of my Toyota, I’m actually averaging a bit better MPG than advertized but that has more to do with my driving habits and my typical work commute.
I don’t know about the Toyota, but I did get more than the advertised MPG for my Geo Metro.
It advertised 48 mpg and I got 54 mpg.
There are tons of factors in what you get in the real world. How you drive and how you maintain your car make the difference.
There are a ton of factors for car mpg vs power usage for lighting.