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By how much can driving smoothly reduce fuel consumption?

  1. 5%

  2. 10%

  3. 15%

  4. 20%

The correct answer is: 15%

Driving smoothly, as opposed to aggressive driving, can reduce fuel consumption by up to 15%. This is because aggressive driving practices such as rapid acceleration and hard braking can use excess amounts of fuel. Option A is incorrect because it is too low of an estimate. Option B is incorrect because it is also too low of an estimate. Option D is incorrect because it is too high of an estimate. The most accurate answer is option C, 15%.