Anyonoe know of a way to calibrate the DIC , specifically the gals of fuel used . Mine usually reads 2 to 3 gals under actual fuel used , which then throughs everything else off. thanks

There is no way to calibrate the DIC. One thing to do is get all your updates. I don't know of one specifically for the DIC but you never know what the engineers change in the updates.

Thanks for the come back , I was afraid that was the answer

You have different size tires on it?

Yes , have 265's , but they are small , only measure 31.0 ,245's are 30.5 . Doesn't seem it should make that much difference . When I check odom against mile markers it's only off a few tenths in 20 miles , slightly low .

You are probably around 4-6% off because of the tires. Like my 285's are off .1 every mile, giving me a 10% difference.