Debating acceleration techniques

[BEEF]

I am not sure how the Yaris is setup first of all.

This has been discussed indepth over at gassavers.org (I am a member there).

In a stick shift, it is better to get into top gear as fast as you can. In an automatic, it is better to get your torque converter to lock up as fast as you can. That leads to more pedal. The problem with that is that most cars go into fuel enrichment if you give it WOT which is probably what you are talking about. That is when your A/F ratio goes from 14.7 (or there abouts) down to like 12. Some newer cars use wide band O2 sensors and actually always stay in closed loop and never go into fuel enrichment.

I found on my cavalier (my other car) that it was somewhere around 3/4 throttle response when the A/F ratio would drop. My goal was to start off giving 3/4 pedal until I got up to speed. That seemed to net me the best mileage that I could get.

generally speaking, a stick shift yaris usually does around 40mpg. Not sure about the automatic.