Prices rose in West and Midwest, dropped in rest of country.
Alexis Rd. facility investment target.
Company has come under fire from EPA, which has concerns about emissions.
Fuel-efficient vehicles will be built at facility.
Sierra Club shoppers found few knowledgeable salesmen.
Wilkin takes red 2017 Hyundai Elantra with sticker price of $19,290.
The car has a base price of more than $300,000.
Investment expected to keep 800 jobs.
The automakers agreed to pay $553M to ensure owners are able to repair their vehicle.
Exploding infiltrators led to largest auto recall in u.S. history, involving 42 million vehicles.