Question with the dash display

[captnduramax]

Is it possible for the digital display on the dash to be off(and I mean way off ) on MPG? My dash says 21.5 but I am going to guess that when i hand calc it its going to be .... 12 to 13 MPG. If the dash is that far off is it possible to re calibrate it? Cluster was just put in from GMC (5th one) and it has always been off from hand calcing. Anyway through Efi Live?


Thanks for any input

Capt

 

[McRat]

Is it possible for the digital display on the dash to be off(and I mean way off ) on MPG? My dash says 21.5 but I am going to guess that when i hand calc it its going to be .... 12 to 13 MPG. If the dash is that far off is it possible to re calibrate it? Cluster was just put in from GMC (5th one) and it has always been off from hand calcing. Anyway through Efi Live?


Thanks for any input

Capt

Yes, there is a table to adjust the fuel mileage reported.

Normally my tunes aren't off that much if the tire size is right.