I put diesel in my 2005 kia optima gas tank
Don't start the car! Have it towed a local garage where they can drain the fuel tank and clean out the fuel lines and injectors if you did start it.
If it was only a gallon or less top it off with gas and it should be OK.
Search Kia Optima Questions
Kia Optima Experts
Find great deals from top-rated dealersTMSearch
Related Models For Sale
Used Cars for Sale