Speedometer off...new 2010 Corolla S!

[nepali]

Hey guys! I did a search but couldn't find anything on this.

The speedometer on my 2010 Corolla S (that I got about three weeks ago) is off by about 3mph. When the needle on the speedometer shows 70, I'm actually only going about 67mph. I tested this out with two different GPS devices. Everything is stock. Should I have the dealer look at it?

[09CamrySE3R3]

Check your tire pressure...although it shouldnt throw it off by that much. And odds are you wont get into any trouble over 3mph. If you know a cop have him tag you at a set speed and see how that works out.

[LeanBurn]

Every car I have ever drove or owned or had a ride in has this problem. The speedo is always optimistic by a couple of mph.

[ekimnal]

Yeah we already know about that. I thought someone did make a thread. Oh well. Youre not the only one with the speedometre problem

[arabianobsession]

My 2011 Camry's speedo is fast by 3 mph and my 2000 Maxima's speedo is fast by 2 mph. My 1995 Mustang is right on the money. I always wondered if it was a drive by wire thing? None of my accelerator cable equipped cars had problems with a slightly off speedo, but all my DBW ones do.

[Pavin]

though, most GPS will also be off by slight increments.. go through a speed trap at a steady speed and see, or just buy a speed gun**much more fun..

[cabur]

I read somewhere that the optimistic reading is to compensate for tire wear.

[SuperchargedMR2]

Every car that I've ever owned has been fast by 2-3 mph on the speedo. You can correct this by getting a taller tire. I'll use a 17" tire as an example.......

215/45R17 This is what Toyota recommends.
225/45R17 This is what I'm using & the error is now 1-2 mph
235/45R17 This would be very close to perfect as far as the speedo is concerned.

[rallykid]

Mine is too but I never bothered with it. I figure the ticket for 98 in a 70 is going to be the same as 95 in a 70.

[FlawedLegacy]

Originally Posted by SuperchargedMR2

Every car that I've ever owned has been fast by 2-3 mph on the speedo. You can correct this by getting a taller tire. I'll use a 17" tire as an example.......

215/45R17 This is what Toyota recommends.
225/45R17 This is what I'm using & the error is now 1-2 mph
235/45R17 This would be very close to perfect as far as the speedo is concerned.

smaller tire was my suggestion too... I took the tire specs and got one that was within 1 mph range at up to 70mph, have not actually tested, but good enough for me.

[saltydog]

could this explain why some have really good or really bad mileage when checking avg on car display