What happens if you drive a car in second gear at high speed for quite some distance?

I have a new Honda with little less than 1200 miles on it. Today while driving the car I put the gear in S (2) and drove at speed of 50+ mph for around 6-7 miles.
I felt something off about the car as the RPM was between 3500 to 4000 r/min while usually it is between 1500 to 2000 r/min. Also the engine sound was not it usual quite sound that comes - I thought because of the cold weather maybe it was sounding louder.
It was after stopping at a couple of red lights that I noticed that gear was at S(2)
I am quite paranoid about my car and mode of transportation.
Could someone let me know what are the effects of my driving?

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White steam/smoke coming from hood of car and car occasionally overheats?

It's a 2000 Honda Civic.

Over the last 6 months I have replaced the radiator, radiator hoses, and gasket. I had some trouble a few days ago on a road trip and was told I had air in the system. They fixed it and she drove fine for the next couple of days, but then started overheating again. I pulled over, put in a little radiator fluid and she was fine for the rest of the trip - going full speed, stop and go traffic, everything. Haven't had trouble since, except there's this white steam (that smells funny. Not sure how to describe it) coming from under the hood more and more. The car is not overheating when the steam is coming off.

My suspicion is that I put in the wrong combination of coolant and water recently (before I bought the pre-diluted stuff that I've used since) and that that is causing the trouble. But I know almost nothing about cars, so I can't be sure.

Any suggestions? I don't really want to take it back to a mechanic because I've been taking it to mechanics for the last 6+ months and they keep telling me different things. Thank you!

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2010 Honda trx420fa flashing 2 longs 3 shorts?

2010 Honda trx420fa flashing 2 longs 3 shorts?

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Dealership grossly misdiagnosed my car's malfunction?

I brought my newly purchased car(2013 Honda Accord) to my dealership due to mechanical and computer malfunctions. Basically, when I started the car one morning, all of the dash warning lights came on but the speedometer and tach were not reading anything. It was like the computer glitched and nothing was working correctly. The dealership said the malfunction was covered under my warranty and they would replace the dash lights and possibly the ECU to fix the problem at no cost to me. Great! They called me after a week of silence saying that neither of those were the culprit and they happened to "discover" chewed through wires from a rodent. Now they are saying the previous misdiagnosed repairs will not be covered and if I do not file an insurance claim I will have to pay $3300 for their misdiagnosis! How should I handle this? Is it too much to assume that checking those wires should have been first on their list? Now I have a new ECU that was not needed but they claim they cannot return it because it has already been programmed to the car. Help!

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Is Ok to driving a leaking power steering Honda Accord 2006 low mileage car?

Is Ok to driving a leaking power steering Honda Accord 2006 low mileage car?

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I owe almost $15,000 for my co-signed 2010 Honda accord-ex, does it make sense to sell it?

I owe almost $15,000 for my car loan, does it make sense to sell it? I co-signed a car with my idiot brother a few years ago, he's gone into a depression and can't pay off the car anymore. (I'm pretty pissed at him right now) It's a 2 door 2010 honda accord-ex black all leather. Less than 60,000 miles on it. I'm thinking about taking out of my IRA tax free (borrowing from myself and paying back myself) and just paying of the car. Help! What are my other options? Monthly payments are $350

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2007 Honda Civic LX Coupe for 8k?

Clean title, automatic, clean inside and out… It has low miles. 47,000 miles. Is 8000 a good price?

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Sold a car and now they want to sue me?

So I recently sold my Honda for $1400. I m no mechanic and told the buyer that several times. I m 19 years old with no history in working on cars. Well anyways the buyer drove the car (I didn t even ride with them, and did not tell them they had a limit on how far to drive.). They had there neighbor come over who "knew all about cars" and he said it was worth buying. Now they took the car to the mechanic a couple days after buying and he found a lot of rust underneath and the brakes were acting up. The mechanic told them that there was no way I didn t know about the mechanical problems with the car. So then she texts me and tells me she wants a full refund. I told her the car was sold as is and that I didn t know about any of the problems. I drove the car 90 miles a day without ever having issues. So do you think she has a case at all? I never told her she couldn t take the car to the mechanic first, and did not hide the car at all. I wouldn t have cared one bit if the guy who "knew all about cars" crawled under and inspected it further. I didn t get a bill of sale but i am under the impression that all sales are "as is" without a written warranty. Also I am in Missouri if that helps.

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96 Honda civic engine trouble?

I have a 96 Honda Civic. It had a coolant leak on the driver side and I put a radiator stop leak in it.It stopped the leak but now the engine is shaking and it takes 20mins+ for the heat to turn on, if at all. I'm thinking the leak stuff gunked it up but I'm not sure. What could it be. Also I moved from a warmer climate place to a much colder place, could the car just not be used to such cold,especially with it being cold?

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