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In my area the roads are quite twisty and mile markers aren't always present, or consistent when they are. Only place they are accurate and consistent is on the interstate - and I try to stay off that unless I absolutely must be on it.
You are right, and I may need to do it again after new tires. But I pretty much know the problem. It's the solution I'm having trouble finding. The TruSpeed device worked perfectly on my '96 Ranger. One of Ford's "better ideas" seems to be making vehicles which can't be altered mechanically to suit their owner interests! Too many "bells and whistles" to disrupt if we try. It may be something I'll just have to live with.I wouldn't really trust them any place else anyway. On a turnpike or interstate is the best place to really check one out.
On those roads there are two forces working that ensure accuracy. The Highway Department who pays for them, and is going to get every foot they paid for, and then the construction company, who is going to want paid for every foot they put into it
Even a ten mile check on one of those can tell about all you'd need to know
No difference if it's tires or gears. The computer or the speedometer doesn't know the difference. Since that feature must be in the programming, see what the Ford dealer would charge to correct it.
I have a smart phone, it's equal to a tin can and a string, love it!
But the point is, at 50 I would be doing 3.5% less. It's not something you wish to do every day but I have it to a point if my speed is being scanned I know where I'm at, with no worries about what it says on the dashFord says they can't do it. I didn't ask if they meant THEY, my local dealer, can't do it, or it can't be done, period. Next time I'm there I think I'll ask that! I may be flogging a dead horse.
If I'd have known how simple it was to do I'd have had it done last January. I'll get out on the interstate and do some some miles to see just how close I got it. Sure glad I don't have to invest in bigger diameter tires.That's awesome man! When I had to downgrade the 265 to 235 I went to tire sites such as Michelin and looked at their pages which calculated the numbers and then hit the turnpike and found it was accurate
I'm not bad at math so (my difference was 7%) so in 10 miles it would read as 9.3 (plus .7) = 10 which was right on.
It really isn't that hard to figure using simpler numbers and accurate mile markers
I once used the mile markers all the way across Arkansas to figure my gas mileage on an 80 Chevy LUV that had no working speedometer
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