Why is my 2016 Mustang so damn slow?!?

It’s an Ecoboost, first and foremost. I put in supreme gas, but, I could not pull away from a 2017-19 Kia Rio! So, I decided that it was just bad gas. Today, I couldn’t pass a 2006-08 Dodge Ram diesel (the kind with the wide ***, not too sure what they’re called). I’m sure if he didn’t brake I would have passed him... show more It’s an Ecoboost, first and foremost. I put in supreme gas, but, I could not pull away from a 2017-19 Kia Rio! So, I decided that it was just bad gas. Today, I couldn’t pass a 2006-08 Dodge Ram diesel (the kind with the wide ***, not too sure what they’re called). I’m sure if he didn’t brake I would have passed him eventually. But, it was taking seconds for me to catch up. Also, car websites where I can get advice and ask questions like these?
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