Fuel Efficiency and the Yaris

[BailOut]

hystria,

I understand what you are saying but I must point out that if you are watching conditions down the road and making proper adjustments earlier you will never find a time where you need to mash the gas pedal like that. Even when you mash the pedal in a scenario like you mentioned it doesn't necessarily mean the Yaris uses a huge gulp of fuel. Using an SG II will show you that your throttle pedal movements are only suggestions as far as the ECU is concerned. It will only put through as much gasoline as you can burn within the emissions parameters it is happy with.

This by no means indicates that you can run the Yaris hard and expect it to not drink more fuel. It's just that you will hit the maximum fuel rate for most scenarios much earlier than the throttle pedal makes you think.

For example, when climbing my commute mountain I often have the same real-time MPG and fuel rate at 30% throttle as I do at 100% throttle because the ECU was already pegging the math at 30% on the grade.

Due to this I have found that when I'm not hill climbing I rarely - and I mean only once every couple of hundred miles - use more than 20% of the throttle pedal's travel.

Additionally, 20 MPH in 3rd gear is definitely outside the Yaris' power band. If that kind of acceleration is truly needed you'll have to eat the fuel hit in 2nd gear instead.