You should change the oil/filter at least every 7,500 miles according to Honda. I would recommend every 5,000 miles unless you do mostly highway driving.
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The 2008 Accord V6 is designed to run on Regular 87 octane fuel. Using a higher octane fuel is a total waste of money. You will get no better mileage, no more power, and in fact it may cause hard starting if you use a higher octane fuel. It is a myth that a higher octane fuel is better. Use 87 Octane any major brand and nothing else. As to brands, they are all good. I personally use Shell in my 2004 Accord V6.
Yes, higher octane gas does give higher gas mileage for your car. However, the increase in gas mileage may not as great as the increase in the price of the higher octane gas.
As long as it is not a requirement of the engine, such as with VW's, Corvettes, Vipers, Mercedes, and some other higher end cars, then there will be no problem. So if you have an Accord, like the category you put it in, then you should be fine.
87 Octane Regular is the fuel this engine was designed to run on. Using a higher octane fuel is a total waste of money and will provide no more power, mileage, or any other benefit. It is a myth that a higher octane fuel is better. It is not!
Simply put, the higher the mileage the less the value.
Wind resistance.
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No. A car will get better mileage with the correct tire pressure.
Yes. The higher the octane rating, the better the mileage you are likely to get.
the best one is 10-30 any kind because sometimes the seals seize up They also make high mileage oil in different weights, if your vehicle has higher mileage. But I found if you have oil leaks (and I'm sure you do) the best way to go is with a thicker oil; for instance, 20w50 or straight 40 weight.
Well of course the higher the mileage on the vehicle the more chance that something is worn out. So high mileage on a vehicle is a bad thing.