Due to their higher center of gravitity suv cars tend to roll over more easily around curves than regular cars.
In general if you are a normal driver which lives in a city type of enviroment a regular 4 door car is the safest option.
However in certain driving conditions such as snow and mud a four wheel drive SUV will out perform a regular car.
For people that live in the mountains a four wheel drive is a better option due to the terrain they encounter while driving.
The main difference between the different types of gas is the higher the gas octane level the longer it takes to burn up that gas. Since the more powerful V8/V10 gas guzzler vehicles tend to use up more gas then a normal car it needs a octane level which takes longer to burn in order to give you the same miles per gallon as a regular sedan.
For the average driver 87 gas should be enough for regular driving. However if you have a high performance vehicle you are better off filling up the fuel grade that the manufacture recommends in order not to damage the cars engine.
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