Consider the following statements regarding the technical aspects of ethanol blending:
- E20 means a blend of 20% ethanol by weight in petrol.
- Higher ethanol blends may require modifications to the vehicle engine.
- Ethanol has a lower energy value than petrol.
Which of the above statements are correct?
Correct answer: B
Explanation
E20 means a blend of 20% ethanol by volume, not by weight, so statement 1 is wrong. Higher ethanol blends do call for engine and material modifications because ethanol can corrode some components, and ethanol's calorific value is lower than petrol's, so statements 2 and 3 are correct.