Janelle Lewis

Janelle Lewis of Snohomish County, Washington, has been spending about $150 to fill up her suburban.

Now she's driving it 25 minutes out of her way to the Tulalip Reservation.

There, gas is about 10 percent cheaper.

It's worth it to fill up once a week.

There are hundreds of tribally owned gas stations, by and large exempt from paying state fuel taxes, savings they can pass on.

The gas stations also provide revenue for reservations to reinvest in their communities, concentrated in western states where the priciest gas in the U.S.

is found.

For Lewis, finding it at $4.85 a gallon on the reservation has been a boon.

That'll get me through the week.

Amy Held, NPR News.