Can you put 85 in a car that has always run 87?

I lived in Ma and I have always put 87 in my 2003 Honda Accord 2.4 4 Cyl. I just drove cross country to Idaho. They have they sell 85 in all there gas stations as unleaded, where in mass 87 is unleaded. They also sell 91 as premium. I have put 91 in my car a few times and I know it doesn't effect it in anyway. I just didn't know if I could put 85 in it without causing problems. Because they don't sell 87 out here, its either 85 or 91 and there's about a.45 cent deference. It would be nice to save the money.

How important is it to have your transmission and radiator flushed?

I have a 2000 Honda Accord and when I took it to Jiffy Lube the other day they said I'm overdue to have my transmission and radiator flushed. How soon should I have this done? Is it important? Also, a price estimate would be nice. I think Jiffy Lube wants $150 for each.

Car continues to run after the key is turned off?

I have a 1996 Honda Accord. I don't know why it keeps running after I turn it off. For 5- 10 seconds. It's starting to worry me. Any one have an idea what is happening?

Added (1). And is it safe to drive? I'm going on a trip and need to know.

What luxury vehicle costs the least to insure?

I know it depends on a lot of factors, but I'm 16 and I have 12,500 of my own money to buy a car with, my parents may throw in one or two thousand. They will be paying the insurance, and that is the main issue.
I have been driving since I was 14 and have enough experience to not be an idiot and do things like speed to impress my friends.
On Average, what are some NICE cars that don't cost a LOT to insure?
I have been looking at
2006-2008 Infiniti G35
2006-2007 Acura TL
2009 Acura TSX
2010 Honda Accord sport

what do you think of those choices above?
Also, please suggest some cars that are somewhat similar.

What is the best car a teen can get for $14,000?

Well, I inherited a lot of money and I COULD buy a nice car, but I'm saving the majority of it and have decided to spend 11-12 thousand on a car, my dad is putting in $2,000. It is my first car and I will soon be taking my license test. I'm looking to spend 13-14 thousand total.
My parents will be paying insurance, and they do make enough money and both drive mercedes but I understand how they don't want to pay a ton for insurance.
The Things I do want in the car are not much: leather seats, AC, and a sound system that is not horrible.

I have been looking at cars like 2008-09 Acura TSX and that is the car I want the most, but my mom says it will cost a lot on insurance.
Another car I've been looking at in a 2011 Honda Accord, which I'm guessing won't cost as much to insure?

The main thing is, I want something a bit sporty, not a race car, but I don't want a 2003 honda civic if you get what I'm saying

the car should be a 2009 or 2010 model. Suggestions?

7 codes on my 1998 Honda Accord LX

Car has 7 Codes check engine light. Its an automatic and a 4 cylinder
P1381
P0301
P0302
P0303
P0304
P1457
P0300

While i'm driving its hard to accelerate and sometimes if i accelerate tpo fast and hard the rpms go 6000-8000. Also the car while crusing willrarandomly have the cars rpms go fast causing my car to slow down or even drive 30mph at 5000 rpms

It is NOT the transmission. Could it be a speed sensor? I will give best answer