I think that is the correct RPM for the speed. Yes you do have a four speed trans, but it starts out in second, not first, so your shift count is right.
To have it start out in first, from a standing start, mash the gas pedal and you will feel and notice the transmission "dropping down" a gear and a sudden surge of acceleration.
This arrangement is for economy.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)