New 2015 prius v (lowercase v for the Prius v wagon) mpg concern

Mileage always gets worse in winter due to winter fuel blends (lower energy density), lower temperatures, falling tire pressure (if you haven't topped off), water on the roads, and cabin heat. Here is a thread about it:
Why mileage gets worse in winter | PriusChat

As for your baseline mpg, there are many things that could be holding it down, including driving style, particular driving route, and traffic conditions. I don't see anywhere near enough clues in the thread above to point us in the right direction, so please fill out as much of this questionnaire as practical and post the answers here:
Fuel economy complaints/queries? Please copy, paste & answer these questions, esp. if you're new | PriusChat

 

hey! who violated my post?

 

try eco mode on a tank and see what happens. what is the epa mpg rating?

 

Re-ordered a bit --

The wider 17" tires produce lower MPG than the 15" ones, but the EPA does not force a separate rating. The sticker is a weighted average of the sales mix, with is heavily dominated by the 15" version.

Many of us push pressures higher for better MPG, but your 17"ers cannot take as much extra before producing a too harsh ride.

That outside temperature alone hurts engine efficiency. (Grill blocking in winter can help this.) The cabin heat then sucks more heat out of the engine, which must be replaced by a bit of fuel burn. Auto Set at 70 then sucks more heat out of the engine than a fixed fan setting of lower temperature. And using remote start to warm the cabin before you step in, means that much of this heat comes from an initial fuel burn, not from 'waste' heat during the driving cycle.

This becomes a trade-off between MPG and human comfort (and possibly safety, if the windows need heat to maintain visibility). If you want winter comfort, just be aware that it costs extra fuel. MPG should improve significantly when warm spring weather arrives, peaking the day before air conditioning season arrives.

It may also be useful to reset one of the trip meters both morning and evening, and see how much MPG difference appears between mornings with remote warmup, and evenings without warmup. But the differing outside temperatures will complicate the comparison.

Dry roads produce the best MPG. The more water that the tires have to push aside, especially at highway speed, the lower the MPG.

Short trips produce lower MPG than long trips, because the substantial warmup fuel penalty is amortized over fewer miles. Your commute is a medium distance, so MPG ought to be neither the best nor worst.

 

Hi. I've been away for a while as we had traded our Prius II for a Sienna Van which has now been traded for a 2015 Prius V. I have keep very detailed records on all my vehicles and I've noticed the following: (1) The mileage will improve as you put more miles on the car; (2) the car computer MPG is usually on the average 5% higher than actual calculated MPG. That being said, let me make a suggestion. Try to purchase your fuel as much as possible at the same station and even use the same pump if possible. Find a station that has a large sales volume as that will tend to give you a better fuel quality. Now I'm trying something new with our 2015 V. We have a local station that sells 100% no ethanol gas and I've used that for our first two fill-ups and I plan on using it as much as possible. As long as we are not on a trip this will not be a problem. I will use 90/10 when necessary. My previous experience showed about a 2 mpg increase (Honda Fit) over 45000 miles with 1/2 being 100% and 1/2 being 90/10. It is my opinion that over the life of the vehicle, the 100% fuel is better for the fuel system. In our area every yard maintenance service uses 100% as the 90/10 causes problems with their equipment. Granted a car is different, but I still think there is a positive affect. I don't think that the additional co$t is offset by any fuel increase, but that is not my main concern.