The 2021 Nissan Altima has minimal changes. This year, you can get a second turbo engine on select trim levels. There are some adjustments to trim-specific amenities as well. You can order a Nissan Altima in the same five trims that were produced in 2020. While there are some differences in features among the trims, you'll find that all trims have plenty to offer. The Nissan Altima has impressive gas mileage and fuel economy that earns it the award of one of the leading cars for gas mileage by Edmunds.com.