Hi guys, I am new here. just came to know about this site. I read the "New Members Read First" post and followed the links to the topic gear X at speed Y but couldnt get the info i wanted. I have a 2003 Ford Focus SE 5-speed. I have been driving it for about 2 years. I always wondered whether I am driving in the most fuel efficient way with proper gears at proper speed. this is my driving habit. 1st gear: just to move to about 10mph 2nd : 10 to 20 3rd : 20-45 4th : 45-50 5th : change to 5th from 4th if i am going to be on 50 or above for a long time. i get about 25 city/ 36 Hw the focus has a small upward arrow light showing if you are supposed to change gear . It doesn't matter if you are supposed to shift or down shift it just shows a upward arrow. but i don't know how reliable it is. when i drive to my work there are places where i should go at 20 -25 mph. i travel at 3rd gear. most of the driving is 35 & 40 and i go in 3rd gear. also if I am supposed to travel a long stretch at 40 should i change from 3rd to 5th so i travel at low RPM. do i save fuel by doing that or am i hurting the parts. most of my driving is flat surface except for 1 railway bridge. is my driving habit right?