Originally Posted by Natalya
What summer tires did you end up getting? I'm doing about 3 MPG better than your stats using Bridgestone Ecopias sized 175/65/R15. Ecopias were spec'd for 2011's and above, but in 2012 they switched to a larger tire size.
I also run my tires at 48 PSI which is a bit higher than sidewall. But I also have coroplast panels under the bottom of the car to smooth the air flow, so maybe our numbers would be about the same if I removed them.
I ended up getting Toyo Versado Eco 175/65/R15 (All seasons - which just means late spring, summer, and mid fall to me) -- They were the lightest ones the dealer had at the time. Quality of them overall seems average, I had a flat 2 months after the tires were replaced (leakage out the side wall), then 12 months after that the same happen on the opposite side. Neither Toyo nor the dealer would pro-rate neither tire saying wear and tire. I suspect I had 2 defectives ones still.
The PSI does make a difference in the mileage (~0.5 L/100 km, ~1 MPG US), but if I put in more than 5 PSI over the Versado's tends to "screech" when it hugs the road on roundabouts or tight turns. I run them at 1 or 2 PSI higher than recommended, on the old OEM (Dunlops), I had them at 7 PSI over recommended with out the same issues.
I think the worsening mileage in the last year were a combination of bad 12v battery and dual drivers now. I had been using an EeePC to log it all but when the Raspberry PI came out I switched, then again when the Raspberry Pi Zero with the OBD-II to log all the data and dump it into a spreadsheet, the difference in driver use is about 1L/100KM which is enough to slowly track the decline in good mileage. The leaf training I had and did really trained me to drive the insight differently than my wife's regular car driving habits.
I love the shield idea on the bottom of the car, unfortunately I don't have access to anything that will allow me to make or install something that fancy.