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I agree with the concept of stay in higher gear as long as possible.
However, the sg is estimating FE based on the airflow and it's perceived fuel flow. But, at WOT, the engine enters open loop mode where the ECU is no longer regulating the mixture (same as when you first crank up).
My Sg appears to be inaccurate while I'm in open loop mode. It will consistently claim that I'm getting 45mpg at 19TPS until it switches to closed loop, at which point it reads 30mpg.
The point of this is:
In spite of the Sg's possible inaccuracy at WOT, IT IS STILL BEST to stay in 5th gear.
BTW Taco is doing a great job at 66% over EPA!!
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