Yes and no. They want the odometer to be accurate, but the speedo, it doesn't matter. I think the speedo is optimistic with stock-size tires to keep you from getting a ticket (like i usually go 10 mph above the limit, at 65 that means i'm going 75 according to the speed, but i'm REALLY going 73 on stock size tires)...so I suppose you can't really say that DC didn't care about the consumer:))

Tonight I'll set my trip odo and watch the mile markers. I'm almost 100% sure it's off.

Lately I started multiplying my gas mileage by 1.07, cause I figure that the speedo is off by about 7% from my 215/75/16 to 245/75/16. And I'm actually getting like 20 mpg, whe I do all highway

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04 KJ Sport
K&N RF-1027
245/75/16 Kumho Road Venture KL-78 on Limited wheels

Down Right L.O.S.T. Florida #223221
http://www.cardomain.com/ride/2224536

From driving through construction sites with the speed displays i think my speedo is about 10 km over the speed im doing. speedo shows 80 and the radar says 70. When driving past the odometer check signs i should have gone 5 km but the odometer only says 4.6 kms. They cant be linked because mine dont add up.

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06 Liberty CRD Sport, Lifetime Sirius Radio, Dynomax muffler(no wimp), EHM, ORM, OME lift, ARB bull bumper
Waiting for time to put on:
cat fuel filter, filter bleeder, clean air supply for egr
Yeah Its A Diesel