2018 Toyota Sienna - Poor mileage

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.)

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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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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Some things that can cause poor mileage.

A thermostat that’s stuck open.

A faulty coolant temp sensor.

Tester

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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Did you used to get better milage? How much?

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