# 2016 Toyota Prius - Mileage Dropping

**URL:** <https://community.cartalk.com/t/2016-toyota-prius-mileage-dropping/144636>\
**Category:** Maintenance/Repairs\
**Created:** [July 17, 2019, 11:41pm UTC](https://community.cartalk.com/t/2016-toyota-prius-mileage-dropping/144636 "2019-07-17T23:41:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Denis39](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@Denis39](https://community.cartalk.com/u/Denis39)\
**Post date:** [July 17, 2019, 11:41pm UTC](https://community.cartalk.com/t/2016-toyota-prius-mileage-dropping/144636/1 "2019-07-17T23:41:41Z")

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My Prius has 31k miles and is driven mostly hot,hot Phoenix. Over the last two months I noticed the mileage has dropped from 54.8 to 50.4 . Is this normal battery degradation over time?  
Thanks!

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [July 17, 2019, 11:43pm UTC](https://community.cartalk.com/t/2016-toyota-prius-mileage-dropping/144636/2 "2019-07-17T23:43:55Z")

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No, it is more likely lower air density with temperature.

Or possibly you just put a new set of tires on that are not as good for mileage as the original set.

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [July 18, 2019, 2:37am UTC](https://community.cartalk.com/t/2016-toyota-prius-mileage-dropping/144636/3 "2019-07-18T02:37:55Z")

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Try driving without using the air conditioning for a week, see if you get desirable fuel economy.