Help -10% Mileage Drop with New Tires!

it looks like everybody is getting 10% reduced MPG on all those name brand tires. I got Bridgestone quiettrack for my 2010 prius and I got 43.5 now. I used to have 50.3 with my Goodyear Assurance for the past 4 years. I read that even the energy saver took a hit of MPG too. Do you think they all did that on purpose just to force all of us to switch to tesla? U think im joking and conspiracy theorist. I guess not because all I read on here are almost every1 is taking a hit on MPG with new tires.

 

i have energy savers, no loss. no idea why

 

Different tire pressure? Tire surface smooths out as they run the first hundreds of miles.

I saw no change that I noticed and I charted every fill up..

 

Went from OEM 215/50R17 TOYOs to oversized 225/50R17 LRR Continentals and saw no hit.

 

This is from Tirerack.

New, Full-Treaded Tires Generate More Rolling Resistance Than Shallow-Treaded, Worn Tires
Tire rolling resistance gradually drops by about 20% during the life of a tire as the tread wears from its original molded depth to worn out. This can be attributed to the reduction in tread mass and rubber squirm, as well as subtle hardening of the tread compound during years of service and exposure to the elements.


https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=177

 

This is from Tirerack.

New, Full-Treaded Tires Generate More Rolling Resistance Than Shallow-Treaded, Worn Tires
Tire rolling resistance gradually drops by about 20% during the life of a tire as the tread wears from its original molded depth to worn out. This can be attributed to the reduction in tread mass and rubber squirm, as well as subtle hardening of the tread compound during years of service and exposure to the elements.


https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=177

 

I fully expected that but didn’t see it. Perhaps LRR are smoother/cleaner out of the molds.

 

As above, I would just expect a MPG dip, when going from worn tires to brand new tires.

But tires are such a well thoroughly reviewed product today, with so much information available, that everyone with access to a computer and the internet should be able to choose a tire that most closely meets their priorities.

I personally put more stock in long term owners reviews.
Manufacturers claims, I think often border on the miraculous.

But I would expect, if you've bought a Low Rolling Resistance tire, designed for fuel efficiency, you might experience an immediate drop in MPG but that would level out in time.
If you've bought a tire that's tread design supports other priorities? Then you simply may take a hit.

I had Goodyear Assurance tires on my Prius, and the MPG was good from day one.

 

I too have experienced this problem. I went from getting on average 48HWY / 52CITY to now Im getting 35HWY / 40 CITY and I have 74K miles on my Prius C 2014. I just got new tires about 1,200 miles ago and thought if I had the same tire measurements put on maybe there's not going to be a discrepancy. Now I'm wondering, I went with a tire that was recommended for the Prius C but directly after I drove it, I could tell that the battery wasn't charging and after driving it for 30 minutes my battery was always on 2 bars never more than that. There's no check engine light... I'm at a loss please help.

 

How many miles on it?

 

I got some of those tires too, the shop gave me a warranty as well. How much more comfortable do you feel they are than your old ones? Whats is your psi?

 

I drive a 2010 Prius too, and put Bridgestone tires on it last year. They're noisy, they vibrate. The gas mileage dipped a little at first, then came back up. Now I always get between 47 and 52 mpg. If I live long enough to wear these out, I'll change to Goodyears.

 

Let them break in a bit, then keep the pressure at 40-42 cold.