Whats Under the Hood?

In today's society, few people get around without personal transportation. The auto mobile has given us the ability to go nearly anywhere, anytime. But, now, how many of us really understant what makes an auto mobile "tick"?? Knowing the basics of what is under the hood can be a life saver. Check your fluid levels - inspect the belts. Don't forget considering the outside too: unusually worn tire tread could be a sign that there is an alignment problem and also could be impeding your fuel mileage. Also< why doesn't the big oil companies just settle to make/manufacture just ONE grade of fuel? Why not just have Super Unleaded (( diesels excluded )) and therefore all auto s will always burn optimum efficiency and even with today's better computer controlled cars which don't require a high octane fuel won't suffer. Besides,, would not just one Fuel simplify and reduce the price per gallon? What is your opinion? I'm asking.,.!!