What are the octane ratings for different grades of gasoline?

The correct choice indicates that the octane ratings for different grades of gasoline are as follows: Regular gasoline falls within the range of 85 to 88, mid-grade is from 88 to 90, and premium fuel has an octane rating greater than 90.

This selection accurately reflects the standard classifications of gasoline grades in most regions. Regular gasoline typically has lower octane ratings to accommodate engines designed for such fuels, while mid-grade gasoline offers slightly higher ratings for improved performance. Premium gasoline, with an octane rating exceeding 90, is formulated for high-performance engines that require better fuel stability and reduced knocking.

Understanding these ratings is critical for maintaining engine health and optimizing performance based on vehicle specifications. Each grade of gasoline is engineered to perform optimally within specific ranges, ensuring that vehicles operate efficiently and effectively. The other options present variations that do not align with the general standards set for octane ratings, leading to misunderstandings about fuel usage in accordance with vehicle requirements.