Hi fellow Carens lovers!

Just want to compare notes;
My EX A/T (2008 Philippine 4-speed model) shifts gears at ff speeds per speedometer and LCD readout:
01-09, 1st Gear;
10-29, 2nd Gear;
30-69, 3rd Gear;
70- up, 4th Gear!!!
With my other car with M/T (5-speed), I usually shift at speeds lower than the above to conserve fuel since I was led to believe that low rpm meant low Fuel Consumption.
I usually shift to 4th at 40km/hr and 5th at 60km/hr.
Questions:
a) Don't you think 3rd gear speeds are too high?
b) Can we ask the Carens Service technicians to adjust the "Shift Gear system" to lower the 4th Gear shifting speed???