Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
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Regular as in 89 octane? Why yes there is a reason. You can actually get 2-3 mpg better with higher octane. Which means the money you spend at the pump on 91 or 93, will save you money in how often you have to stop. Lower octane also means that the fuel has a higher tendancy to cause engine knock. Which is bad.