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Premium gasoline is unleaded. Yes, you can use it, although there may be no actual benefit in it.
Big boom-boom.
You get a lower gas mileage because it needs more fuel at one time to reach the maximum potential, and it still doesn't have very good performance.
Yes you can use premium gasoline in unleaded because premium gasoline is also unleaded. The only reason it is called premium gasoline is because it has a higher octance then regular unleaded. Regular unleaded has an octane rating of 87 and premium has an octane rating of 92. Premium gasoline burns slower then regualr gas because it has a higher octane rating.
Not as long as the premium fuel is also unleaded.
always premium gas
Yes, that is what Toyota recommends. Using Premium fuel will provide no benefits whatsoever and is a total waste of money.
The best gas mileage from unleaded gasoline or premium gasoline depends on the car. Old cars get better mileage from unleaded.
Unleaded Premium
You can use either regular unleaded or premium unleaded.
They're usually Regular Unleaded, Mid-Grade Unleaded and Premium Unleaded.
Depends... What does you owner's manual say? I currently drive an E-Class 320, and it requires Super Premium (91-92 Octane level). If I even try to use Premium instead of Super Premium, or even worse.... regular.... the sensors in my car know within a few seconds of turning on the car.