Will Premium Gas 91 harm my engine if it can take 87 Regular?

At Costco this morning regular gas 87 ran out so I was forced to buy 91 premium (at regular price).

This is the first time my Nissan Rogue 2017 has gotten it. I had to get it because I was running out of fuel and such.

I have noticed a little better acceleration but is it bad for the engine? What is the difference anyways?

My friend said in his 2019 Civic Touring that Honda said since its almost a luxury car by it being the top of the line model its best to put in premium. He was saying his car is turbo charged.

Can I get into trouble for this?

Long story made short:

Friend: josh
Honda guy: hector

My friends car broke down but I know of a guy who sells cheap Honda parts so I told my friend josh that I know of a guy who sells cheap parts and that he would charge $100 for the part he needs. I ask my friend the year and engine of the car and he told me it was a 2005 Honda Civic. Josh gives me $100 and I go buy the part from hector. I buy the part and give it to my friend. It turns out his civic is actually a 2008 and it's a completely different engine. I go back to hector and he tells me there's no refunds or exchanges. We have to keep the part. My friend josh gets pissed off and started telling me that I'm responsible now for the $100 that we lost. He wants me to pay him the $100. He said he is bringing the cops to my house today. I don't see how I did anything wrong. I also don't even have any money to give him either.

Can I get into trouble?

What else could could be wrong?

My stereo in my 2002 Honda civic la sedan wasn't working right so I had a friend check it out. Be got it so my stereo would work but now the a.c stopped working. When you try to use it the fans turn on for a second then automatically switch off. The mechanic shop said I need to change the control panel but I don't want to get a replacement then this isn't the issue. Is this all I can do to really know. What else could it be?

Can a Car dealership legally force you to pay off your car before its due?

My friend financed a 2017 Civic in 2017 and she has gotten into 3 accidents 2 of them being her fault.

So Honda saw that she financed the car from 2017 to 2022 a 5 year finance. Then earlier this year they asked her to pay off the car in full by the end of 2019. They explained to her all the accidents and stuff and I guess they did not want to lose money just in case they had to Repo the car cause she only works part time.

They probably didn't think that she was able to afford the whole car and probably thought that one day they would have to Repo the car and be left with a car in 3 accidents.

On top of that after the 2nd accident her Insurance company dropped her.

Can I still graduate highschool in time or may I have to stay in highschool for an extra year?

So the school year just started and I'm supposed to be a junior, class of 2021, however my student profile says I'm still currently a sophomore most likely because I failed about 3 classes in my sophomore year due to some regretful, idiotic decisions I've made. Assuming I pass my junior level classes this year and make up all the missing credits from failed classes from sophomore year via summer school, will I be moved up to be a senior next school year or will I be classified as a junior but still graduate on time with my suppose-to-be senior peers. I'm sort of panicking because of the situation I put myself in and don't want to be recognized as the stereotypical "21 year old pothead, Honda Civic driver still in highschool" guy. Any input would be highly appreciated.

2009 Honda Civic - Is climate affecting it starting?

It was slow to turn over one time a day or 2 ago.

It took 2 cranks to turn over this morning. It's a new battery.

Bought the car the beginning of August last year and around the same week (last week of August), my battery died.

A month and a half ago, it was pouring raining and it took 6 cranks over a period of 10 minutes to turn over.

What's going on here? Car hates muggy, rainy weather?

Brake lights on 2009 Honda Civic?

Both lights seem to not work when the lights are off when pressing the brakes although when I turn the lights on they turn on but stay on even without pressing the brakes. Anyone have an idea what it can be