2015 Prius Trim 2 subpar MPG

I'm getting very good milage with my 2015 persona model. sometimes it can be the tires, altitude and if your a lead foot. let the car calculate the mpg.. colder temps will require a decent warm up for a few min. I'm getting anywhere from 45 to 57 mpg mixed in nj winter temps and summer with full ac running I'm getting close to 55 plus mpg mixed city and Highway. it also could be bad fuel.. I had bad fuel from Costco, car was very hesitant ans sluggish.. try changing fuel.. use 0-20w oil mobile 1 green cap and mobil 1 premium filter. let us know after a different fuel fill up.

SM-G935T ?

 

I'd swap.put the fluids, dealers use that cheap oil synthetic blend crap. I only use mobil1 the one made for Honda and Toyota hybrid cars.

SM-G935T ?

 

that was Dec 6th I drove the car last.. mixed city and Highway driving about 70mph give or take with NJ traffic , Temps are 30s

SM-G935T ?

 

mobil1 oil filter.. I picked up a bunch on amazon for 9 bucks.. normally 20 bucks.. here is a few pics of my milage, a little has dropped once I changed out the oem toyo proxes.. but can't complain with current tires.. FYI I'm running 17s.

try new fluids, filters, and try a different gas station.. plus you need to break the car in for at least 2k miles to see a difference in mpg as well.. good luck and keep us updated. I've posted pics for my daily commute..

SM-G935T ?

 

sorry for the sideways posting, that Tapatalk app..

SM-G935T ?

 

The first tank I had of my CPO 2012 last year was about like that, high 40s on HSI. As an experiment, I tried not driving so carefully and switched to power mode. I drive pretty conservatively anyways, so it's not like I was going to hot rod it. My MPG went up by about 5. I was spending my time accelerating slowly, which is less efficient than quicker stronger bursts. So now I use power mode almost all the time (really because it matches the pedal feel of our other car) but it has never been that low again. Maybe try not granny driving it for a tank just to make sure it's not something with driving technique. Also, depending on how long you've had it some say the ECU goes through a learning curve and improves MPG over time.

 

I only use power mode to merge in heavy traffic, I just drive in normal, never in economic mode, too spongy.. acceleration is not bad.. could be better.. but for what I use it for its fantastic. if I want a faster car, then the mpg will hurt.. power mode will only last till the battery drains out, then you back on the engine..

SM-G935T ?

 

I change mine every 10k.. or if the car feels sluggish, I don't burn any oil ans still comes out brownish yellow not black..

SM-G935T ?

 

make sure it the hybrid formula , the one with green cap. any other will have sluggish performance.

SM-G935T ?

 

Lots of issues that can affect your fuel mileage in a Prius.

1. Are you driving with the A/C and or the Heater on?
Both will affect your fuel mileage in a negative way.

2. What tire pressure are you running, above 40 psi, or factory recommended pressures?

3. Speed kills mileage

4. All gasoline is not the same.
My 1997 Volvo 960 was getting around 26.5 mpg at 65 mph.
Always ran the cheapest premium I could score.
Added a bottle of Techron and two to three tanks of Shell V Power with Nitro
the car is now back up to 29.2 mpg at 65 mph.

Switched my Prius back to Shell exclusively, after a bottle of Techon and a few tanks
I saw my highway mileage increase by about 1.5-2.0 mpg

Yes there is a difference between El-Cheap-O gas and a top tier gasoline.

Check your wheels and make sure you don't have a sticking brake caliper or parking brake.

I don't know why people have an issue with Toyota's 0W20 oil. It is a very good oil right up there with any of the top brands synthetics.

I do bi-annual oil changes with factory 0W20 and have had ZERO oil issues with 64K miles.

 

Well if you slowed down to 65 mph your fuel mileage would be in the fifty two to fifty four miles per gallon area.

 

are you in cold country with reformulated gas? have you tested the 12v battery? a dragging caliper will not set off a dtc. you have to spin the whel or at least feel for heat after a long drive.

 

Hi there, I am also in Cali, Bay Area to be exact. It is the colder weather that's causing the lower MPG, nothing really to worry about. See my below graph for my winter gas mileage in Dec and Jan., always down to 47mpg while my other months I can go over 50mpg calculated. Once we are into warmer months your mpgs will be higher.