Edmunds Answers

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  • avatar MrShift@Edmunds 08/14/08 12:30 am PST

    The 195/60/15 is better. This will give you a speedometer error of 2%, so that when your speed says you are doing 60, you are actually doing 61.2

    I don't think gas mileage will be affected although you will THINK so since you are traveling further than your odometer says you traveled. It says you went 60 miles in an hour but you went 61.2

    Your stock tire does 850 revolutions per mile but the new tire, being slightly bigger, will do 833 revolutions per mile.

Answers

  • MrShift@Edmunds 08/14/08 12:30 am PST

    The 195/60/15 is better. This will give you a speedometer error of 2%, so that when your speed says you are doing 60, you are actually doing 61.2

    I don't think gas mileage will be affected although you will THINK so since you are traveling further than your odometer says you traveled. It says you went 60 miles in an hour but you went 61.2

    Your stock tire does 850 revolutions per mile but the new tire, being slightly bigger, will do 833 revolutions per mile.

  • nitrobrain 08/14/08 8:54 am PST

    Thanks. The interesting thing is the spedometer reads ~3.5% high now with OEM tires on it. This is accordiing to a comparison to what my GPS says. The GPS has been checked in multiple other vehicles and agrees with all the others so I pretty much trust it. I think either tire will correct the speedo close enough and the odometer along with it. This will seemingly affect calculated MPG. The real question is...which tire will yeild better MPG? and why do you believe the 195/60 is the better choice or was it based on speedo error?

  • coldcranker 08/14/08 10:09 am PST

    Since MPG is the priority here, definitely go with the 185/65 size. It will fit OK, and narrower tires always get better MPG. Look at the Prius and notice they increased MPG by using narrow tires.

  • rickley 12/29/08 2:59 pm PST

    I believe coldcranker is right but for the wrong reason. The 60 or 65 in a tire size is a percentage of the tire width (the 185/195) and is used to calculate the height of the sidewall. .60 x 195 = 117. .65 x 185 = 120.25; a taller tire for which the circumference would be larger and, therefore roll farther with each revolution, giving you better gas mileage. I'm not sure that the width or narrowness would affect mileage as much as the circumference. Both sizes would yield better mileage than the stock tire at only 111mm tall but the stock 185/60 would handle better due to less sidewall flex.

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