After reading several posts re the diff swap from 3.07 to 2.88 on 1984 300 D turbo I find the question of fuel consumtion was asked a few times but never answered. Is there any info or reasoning to suspect the ecconomy would be bad in town and good on the highway, or would the fuel consumption be greater all the time because the load on the engine would be greater, in town and on highway. Could anyone who has done this swap put this question to bed before I rush out and pick up a new differential.