The gas station diesel pumped into the gas tanks

I went to the gas station to pump some gas into my Saturn Vue About $15 into the tank And I drove off I drove about 45 miles One way Will my car run sluggish and it is not just a little bit The very next day I went Back to the same gas station And they told me that their gas tanks had diesel In them And I needed to have my car checked outBut at that time most of the gas that I put in have been burned outAlso put gas in a gas can for my riding lawnmowerAnd today my lawnmower won't startAnd I still have the tank of fuel that's in my lawn mower plus the little bit that's left. Will I need to take my car to the shop and what will it cost for me to have that test it to see if it's diesel in the gas