Fuel Economy

[Shroomster]

Originally Posted by enkid

One thing I've noticed using the SGII and different driving styles and road conditions:

The ECU seems to adjust/tune the performance to the style and conditions of driving over a period of time...for example, if I go from Providence to Boston and back on a warm summer day, and do 70 to 80 MPH, my gas mileage will be in the low 40's that day.....then the next day, same weather, same route, if I semi-hypermile the FE will only be a little better - mid/high 40's....but the following day it'll be back up to 52 - 55 MPG. I've noticed this about a dozen times this summer. The same thing seems to happen when and after rainy weather impacts the FE. The conditions of the previous trip seem to affect the FE performance of the current trip. Could it be that for many drivers, the capability of realizing this really high gas mileage with the Yaris is never noticed because it takes a couple of days of conservative driving under good conditions before it happens?

most al cars with FI do this. because the computer sends info for how much output from the injectors it wants. thats why if any of you ever go on a trip that first tank is not the best...the second and subsequent tanks are...everything is calculated from how much throttle to o2 temps....