for those that came w/ 14's

[thebarber]

for those of us who's yaris came w/ 14's from the factory w/ 175-65-14 tires....it would seem as though the speedo is calibrated for 185-60-15 sizing...

i say this as i was driving w/ friends w/ oem-sized wheels and gps, and since we had radio's, i could ask what speed they were going.

it would seem that w/ 195-50-15 tires, my speedo was off by about 4km/h

that would lead me to believe that despite the fact that my car came with 175-65-14 tires, my speedo is calibrated for 185-60-15

just food for thought next time you're buying tires for your yaris

[Tamago]

do you both have ABS? or neither? or one and not the other?

[Sodium Duck]

Hmph. Is there a way to see what is actually programmed in the ECU (or wherever this info is stored)? This would be really annoying to have to fix in my fuel economy spreadsheet lol.

[thebarber]

do you both have ABS? or neither? or one and not the other?

i dont have abs

friends w/ matrix's both have abs....one is an xr and the other an xrs.

both said they were doing 113-114kph when i was doing 117-118

[marcus]

try using gps..i find them more accurate on reading on ur actual speed..

[thebarber]

try using gps..i find them more accurate on reading on ur actual speed..

both guys were using gps that agreed with THEIR speedos, not mine

[regal]

This is interesting info, I try to keep the diameter as close to stock as possible, otherwise your data is off and it can affect your gas milage as well.

I wonder if they ran the EPA MPG test on 14"s or 15's ?

[thebarber]

This is interesting info, I try to keep the diameter as close to stock as possible, otherwise your data is off and it can affect your gas milage as well.

I wonder if they ran the EPA MPG test on 14"s or 15's ?

i honestly have no idea...its a clusterfuck

[spookz]

That's odd.. my Yaris comes with 185/60R15, but when my speedo reads 60km/h, the GPS reads ~57-58km/h.. Maybe my speedo is off, either that or my GPS is not accurate.