Unleaded gas prices are up nearly 20% to $3.88 since the start of the year, according to AAA. But they're still more than a dollar per gallon below last year's $5 peak in mid-June.

California has the highest price, with a weekly average of $5.85, a gallon but that cost is also down 31 cents from a week ago. The West Coast as a whole saw a 93 cent drop from a week ago, to $5. ...

That may have you wondering: Is it OK to try E-85 gas in your car? It's more than a dollar a gallon cheaper than regular unleaded. RELATED: Midwest could add more ethanol to gasoline under EPA plan.

Most states have the option of choosing 87, 89 or 93-octane. But in a few states, the gas pumps look a little different. Like many of Colorado’s fun facts, it has to do with the altitude.

Sheetz announced Monday that the price of E85 (flex fuel) will be dropped to $1.85 per gallon from April 17 to midnight on April 30. That’s about half of the national average for a gallon of gas ...

While 85-octane gasoline remains the dominant fuel choice in Colorado (as well as other high-altitude regions in the United States, such as Wyoming, Montana, and Utah), ...