Because you care about how many tokens are used per task. What you said is like only caring about the price of gas and not gas mileage of your car.
here, it does less work, it's more like driving half as far but still paying the same total cost
this being said, K3 and E1 models are priced the same at $3.00 / $0.30 / $15.00
Will be taking Ember-1 for a spin on Monday and hopefully enjoy those better MPGs
Wouldn't the op be more correct with their gas/distance comparison?
Because both cars get to the same end destination (complete the same task).
Unless your end goal is to see the token numbers go up, but I'm not sure why that would be of interest.