2013 prius c no codes but reduced mpg's

car has 92k so I'm wanting to hold on to it if possible. thinking reduced mpg's the result of failing hybrid battery. really can't think of anything else though I've decided to go to a dealer here in bradenton fl. for a diagnostic to c what they say.
as I've been scoping about for a replacement, currently the dealers are at @ $4k for a new(?) hybrid battery. some come with different warranty lengths as well and on the gulf coast I have only about 3 local to me. have read some of the posts about after market vendors who seem to b in general renewing(?) old batteries and hoping they last long enough not to have to deal with warranty issues or, if so, to rope a dope the customer about till he surrenders.
not sure how to move forward and looking for advise. tia

 

dear bisco
my mileage has consistently been 55 mpg's. now more like low 40's high

dear bisco
mileage was consistently 55 mpg's. now more like low 40's and high 30's. when I drive using staying in the ev mode my mileage also seems to deteriorate. why would you think the 12volt might b impactful. mine is 5ys young of a 7 yr warranty thur the dealer?

 

thank you rjdriver.
$1724.00 is much more tolerable than $4k at the dealers and comes with similar warranty parameters. that said, who wants to b in bed with a warranty issue to resolve with combative sellers? green bean seems highly rated and seems to make sense to me. don't understand the 12 volt battery remarks. thought the regular battery was mostly there to start the vehicle and maybe get the computer active? not sure why its mentioned when mpg's decline?
in any event, thanks for your advise. appreciate..

 

thanks for the input leadfoot. that's an interesting perspective. doubt the c qualification makes a difference in this situation. why would it? have the vehicle at the dealer for diagnosis. still haven't heard a peep out of them and dealers never inspire my confidence but such is life I suppose

 

dear rjdriver,
basic prius c and no car button to press, just your regular ol' car key I'm afraid. still waiting on dealers service to give me a holler.

 

thanks mendel but no new tires nor recent brake work. did front ones about 10k ago and rear ones checked and still good looking. still waiting on dealer's service dept for a diagnosis. at 11 yrs young, am thinking hybrid most prob even though I only have 92k on the odometer. when I drive on ev alone and avoid using the ice, I don't see mpg improvement. actually they go down slowly. hmmm

 

thanks all for the counsel. but and this is a big butt, the dealer found nothing wrong. so at square one. 12volt battery and hybrid both ok. tires good. maybe a fuel injector cleaning but I lose mpgs even on ev only without ice so am not overly gung ho on finding a gas treatment and have over the yrs never found chemicals would work magically as well.
so irrespective of no codes showing, I"ll just use it till something shows up. at 38 mpgs about now. not ideal but still better than my subaru and walking I suppose.

 

thanks leadfoot, interesting perspective and obviously worth a peek. in florida, its not an easy trial however as temps of late have been in the 100's and its not even summer as yet. it does makes some sense however that after 11 yrs refrigerant might b on the low side of things but it still blows nice and cool. in maryland with kids, etc but will b back at the ranch early next week and will give your perspective a look see. thanks for hanging along with my issue. was very disappointed with the dealer. $100 for nothing basically though they said they would b happy to rotate my tires. am I lucky or what?

 

yes rjdriver and for 11 yrs it has consistently run at 55mpg's and not 38 or low 40's. my foot is light and again if I run on ev alone, I still lose mpg's, at least a tenth every mile or so. don't know how low I can go but like the perspective of leadfoot and the ac connection. other than that I'm still quite flummoxed by almost a 40% reduction in mileage. that's pretty significant and wouldn't you think something or things would clearly present itself as the culprit?
anxious to get back to florida and run the ol' girl without ac and see what if anything happens?
thanks rj