Why has my gas mileage dropped?

I drive a 2014 Ford Focus ST. I recently reset my dashboard stats and noticed my average mpg has gone way down. So I reset it again and did some slow driving. I used to get around 31 mpg highway and now I'm getting 24. Tire pressure is fine.

What radio set up should I️ use in my '13 Ford Focus se?

A couple weeks ago, I️ bought a 2013 Ford Focus SE. The radio had a popping issue and the dealer said it was no problem and they would replace it. They informed me that they could not get an OEM Head unit to replace it, so they used a Metra dash kit. The kit looks fine, but they put a cheap blaupunkt receiver in it, which I️ am very upset about. Aside from that issue, the sync screen at the top of the dashboard that used to show the song information, time ect. Doesn't show anything but the time anymore. Is it possible for me to get a double-DIN receiver with a touch screen, AND have it link to the sync screen? Also, can I️ still use the steering wheel controls? And if all else fails, is there any way I️ can just get an oem head unit again?

Is my 2007 Ford Focus SE able to pair with my phone?

I have a phone button. It is the only button that relates to any sort of phone pairing. I don't even have an buttons on my steering wheel besides my cruise control. When I press the phone button, it says 'no phone'. But I can't seem to find any way to pair my phone. Is my car even able to pair with my phone? If not, then why does my car have a button that says that?