Don't believe the DIC unless you have confirmed its accuracy. Calculate it based on mileage and fuel purchases. (Verify odometer accuracy, too....)
One easy way to check the accuracy of the DIC is to zero the fuel used when you fill up and see if it agrees with your next fill. Repeat a few times to get a feel for its accuracy.
The Constitution needs to be re-read, not re-written!
If you can't handle Dr. Seuss, how will you handle real life?
Current oil burners: MB GLK250 BlueTEC, John Deere X758
New ride: MB GLS450 - most stately
Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510