2015 Prius gas mileage way worse than my old 2008

Yeah only issue though I went with 17 because I really dislike how 15 kinda give on curves

SM-N920V ?

 

So currently I am running 205/45/17

SM-N920V ?

 

We need the trip meter distance over a known distance either mile marker or GPS. This sets the correction ratio needed. I've used my ratio which could be different on your car since it is a different year:

	tire	lbs	Rev/Mile	Tire %	Goal %
1	225/50R17	27	802	96.51%	97.01%
2	P215/50R17	26	814	97.95%	97.01%

I would go with the Yokohama 225/50R17 because it is closer to the 97.01% target, -0.50% off, measured from my 2010. We really need your tripmeter vs true distance for at least 50+ miles because there may be a change in the Prius firmware. However, the P215/50R17 is lighter which reduces inertia effects and only +0.94% off.

The Tire Rack web page is a little tricky so I found three specific candidates:

	spec vs tire	AVID TOURING-S	ADVAN SPORT A/S	AVID ASCEND (H- OR V-SPEED RATED)
1	UTQG	620 A A	440 AA A	740 A A
2	Maximum Load	1477 lbs.	1653 lbs.	1477 lbs.
3	Maximum Inflation Pressure	51 psi	50 psi	51 psi
4	Tread Depth	11/32"	11/32"	12/32"
5	Tire Weight	26 lbs.	24 lbs.	27 lbs.
6	Rim Width Range	6-8"	6-8"	6-8"
7	Measuring Rim Width	7"	7"	7"
8	Section Width	9.1"	9.1"	9.3"
9	Tread Width	7.6"	7.5"	7.7"
10	Overall Diameter	25.9"	25.9"	25.9"
11	Revolutions per Mile	801	801	802
12	Country of Origin	US	JP	US
13	Low Rolling Resistance			BluEarth

Look at the reviews and pick which one matches your expectations.

Bob Wilson

 

My 2012, and my best friends 2011 both can't touch my old 2005 with 300,000 miles. His 2011 gets 42-45 with him driving and my 2012 gets 44-47 with me at the wheel. Our new prii suffer some because we don't have LRR tires I believe. Two of the 4 bald tires on the 05 are ecopias, that baby will roll! 4 bad tires pumped up to the max psi!

 

Well after 3 weeks I'm getting 39.3 guess that's better than 37. Update- I did finally understand what everyone was telling me about how to drive the prius by getting up to speed then laying back on the gas, that's brought it up some.

Posted via the PriusChat mobile app.

 

Aaaaand now to an all time low. At this rate the H2 will be getting better mileage than me! Lol!

Posted via the PriusChat mobile app.

 

Are you willing to run some benchmarks to determine if the there is a problem with the car?

I notice the Indiana Toll Road is fairly close. Would you be willing to run 10 miles, in opposite directions, on cruise control to measure the MPG?

One pair of runs at the slowest comfortable speed and another pair at the highest comfortable speed. A total of four runs using the same start and stop locations for each.

1. Reach the target speed and set cruise control
2. Reset a trip meter
3. Continue for ~10 miles and take a photo
4. Do the same in the return direction

We average the two slowest results as one data point and the two fastest results as another. Then we compare them to:

• Using cruise control removes the human element, testing the vehicle

If the vehicle matches the curve, we can eliminate it. If not, we go through a series of steps to identify the fault.

Bob Wilson

 

Thanks Bob. I will do that this weekend I've needed a road trip anyway

Posted via the PriusChat mobile app.