# 2018 Toyota Sienna - Poor mileage

**URL:** <https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779>\
**Category:** Maintenance/Repairs\
**Tags:** toyota\
**Created:** [July 18, 2023, 7:21pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779 "2023-07-18T19:21:22Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Greg20](https://avatars.discourse-cdn.com/v4/letter/g/ad7895/32.png) [@Greg20](https://community.cartalk.com/u/Greg20)\
**Post date:** [July 18, 2023, 7:21pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779/1 "2023-07-18T19:21:22Z")

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Lousy gas mileage, (12-13 mpg). Had it looked at by the dealer three times, and nothing has changed. (In-town use almost exclusively. In-town mileage was listed at 18-24 mpg by the manufacturer. Nothing seems to be mechanically wrong with it.)

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [July 18, 2023, 8:04pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779/2 "2023-07-18T20:04:51Z")

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Has a fuel trim test been done? If the fuel trim is ok, most likely

- that’s just the mpg you get w/this vehicle given your driving style; or
- you are not measuring the mpg accurately

My daily-driver truck gets 15 mpg, normal, somehow I just live with it.

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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 19, 2023, 8:57pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779/3 "2023-07-19T20:57:47Z")

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You drive only in the city, EPA city rating is 18 mpg. That is an estimate. Your experience is 35% less.

The biggest factor in fuel mileage is the driver. If the dealer finds no issues with the van, it is likely your driving style.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [July 19, 2023, 9:05pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779/4 "2023-07-19T21:05:23Z")

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Some things that can cause poor mileage.

A thermostat that’s stuck open.

A faulty coolant temp sensor.

Tester

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**Author:** ![lion9car](https://avatars.discourse-cdn.com/v4/letter/l/59ef9b/32.png) [@lion9car](https://community.cartalk.com/u/lion9car)\
**Post date:** [July 19, 2023, 9:25pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779/5 "2023-07-19T21:25:23Z")

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Add a sticking brake caliper to Tester’s list. You can check for that by seeing if one wheel is much hotter than the others after driving.

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [July 19, 2023, 9:35pm UTC](https://community.cartalk.com/t/2018-toyota-sienna-poor-mileage/191779/6 "2023-07-19T21:35:15Z")

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Did you used to get better milage? How much?