Since when? I've always heard the opposite of that as a rule of thumb: 3.73's for a standard transmission and 4.10's for an automatic.Usually, 3.73's for an auto and 4.10's for a manual.as for mpg, depends how you drive it.
With 4.10s you'd see approx 2400 rpm at 70 and 2200 at 65. With 3.73s it would be 2200 and 2000 respectively...i have a manual trans.. and the stock 18's for the tires.. i dont plan on putting on a blower for a couple of years. i do drive on the highway but 90% of my driving is only about 10 to 15 miles a day. i want the pep but i dont want to go to steep but i dont think 3:73's is going to cut it. thanks for your in put