UK Car Repair Questions? Ask a Mechanic for Answers ASAP
In today's automobiles, advances in engine technology mean that even if the owner's manual recommends premium gasoline, the car will typically run on regular without issue and won't damage the engine in any other way. The car's performance might suffer only slightly: it might be a half-second slower from zero to 60 mph, for instance. But the average driver isn't likely to notice this drop-off.First of all, premium gas is more expensive because it contains a higher percentage of octane. Why is this important? When vaporized gas mixes with air and fills the combustion chamber, it is compressed by the rising pistons. This makes the gas-air mixture grow hot and it could ignite before the spark plug fires, pushing backward on the piston. Higher-octane fuels can be compressed to a greater degree without self-igniting. That's why premium gas is used in high-performance engines
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