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New tires = 20% efficiency loss?!?!

19457 Views 60 Replies 28 Participants Last post by  vicenac
At 83k, it was finally time to ditch the OEM tires. Getting that many miles out of original tires is proof I drive quite gently (most of the time, anyway)

Yesterday I bought a set of Bridgestone Turanza QuietTracks.

And quiet they are, but I sure seem to have taken a heckuva efficiency hit. My lifetime dashboard efficiency average is 4.81 mi / kWh since most of my driving is in warm flat Florida at around-town speeds - more evidence of my conservative driving style.

Yesterday's driving characteristics (even less freeway than usual) should have resulted in a daily calculated efficiency in the 5.0 - 5.25 range, but all I got was 4.21.
Midday, I aired them up to sidewall max (50 psig) - that seemed to help, but not much

Yikes - I sure hope these tires get better with age!
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at 45 k the OEM tires were worn past the witness bars. Costco didn't have the OEM replacement and had a sale on Bridgestone Quietrack. So I bought them.
As I drove out, I noticed that it was braking much better, but the car would loose traction continuasly under max acceleration and even under medium acceleration in a turn. It's like this car doesn't have any traction control. Pretty disappointed. But then a friend said to wait to break them in.
A day later we had lots of rain. This car is now stuck to the road in wet, even in puddles... no sliding at all. I am very impressed!

However, the range tanked significantly.... probably 20%. I do have to add that the temperature outside also decreased with the rain, to 50s. So that may actually be a big contributor. The screen with the bars, showing what's affecting the range, lists "terrain" as having a more pronounced impact then weather.... So we'll see when the temperature goes back up.

I would have not dared take the Bolt out in the rain with the OEM tires. We had some close calls even on dry asphalt. But with these tires... the Bolt seems to be the most able car in the wet that I've ever had.
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