Odometer accuracy

[dukcaln]

So, I know speedo is off by 10mph....do you think my odometer is off? I was next to my wife driving home in seperate cars and we clicked off a mile together. Once her Camry hit a mile my truck was at .09..... so I am guessing every 10 miles I go, I actually have gone 11.... so 100 miles I would have gone 110 and 200 is 220 and 300 is 330 and so on..... this must explain why I was thinking I should be getting more out of my 40 gallons then what the odometer was reading...thank god.... anybody have similar issues with thiers..

[Goose350]

Yes it will be off. Mine is off, cant remember how bad though

[jsr86]

mines off too. not sure how much. i have 315 tires (i think) and even with the sct rotations per mile thing, its still a little off

[Hank]

Everyone with over sized tirtes has this "issue". Mine was 7% off until I calibrated my odometer/speedometer with my AutoEnginuity scanner. Now it is dead on!

Before I knew I could do this I just compared my speed on the GPS with the speedometer and calculated the difference. Mine happened to be 7%. I would just add 7% to my miles logged before I divided by the gallons used. Now it is much better!

[Davey~do]

Originally Posted by Hank

Everyone with over sized tirtes has this "issue". Mine was 7% off until I calibrated my odometer/speedometer with my AutoEnginuity scanner. Now it is dead on!

OK silly question maybe but where in the heck is that option at? I've searched till I can't search no more and I havent found a place to recalibrate the speedo with my AE anywhere!

[Hank]

Originally Posted by Davey~do

OK silly question maybe but where in the heck is that option at? I've searched till I can't search no more and I havent found a place to recalibrate the speedo with my AE anywhere!

PM sent. Call me tonight if you need to.

[Hank]

Here it is for everyone:

In the Ford module, when you pick your model and year, you can go to the bottom where you pick "generic" or "enhanced", etc., you pick "anti-lock brakes" or something like that. Then when the program starts, you go over to the tabs on the right side where you can run a buzz test, etc., for the Powerstrokes and there will now be a pull down for "Tire Selection" or something like that. Each click of the "<" or ">" on the screen with the mouse (not the ones on your keyboard) will change your tire diameter by 1/2". I run 315 BFG ATs which are not a full 35" high. I put in 34.5" and my speedo is dead on with my GPS!

[Davey~do]

You da man Hank! Dont know how I missed that all these times but I sure managed it somehow.

Now if I could just get it to connect to my wife's truck like it used too....

[Hank]

Originally Posted by Davey~do

You da man Hank! Dont know how I missed that all these times but I sure managed it somehow.

Now if I could just get it to connect to my wife's truck like it used too....

Glad it worked out! Someone showed me that trick a few weeks ago. Wish I had known about it 2 years ago!

[HeavyAssault]

3.5% off with my 35's.