Higher-priced premium gasoline or diesel doesn't automatically translate to improved performance or fuel efficiency for most vehicles. The key factor is whether a vehicle’s manufacturer *requires* or recommends premium fuel—not summer heat or advertising claims. Many drivers are misled into believing premium fuel is beneficial during warmer months, but this is largely a marketing strategy employed by gas stations. Unless your car is specifically designed for it, upgrading to premium likely provides no advantage. Consumers should consult their vehicle’s owner’s manual to determine the correct fuel grade. Focusing on manufacturer recommendations ensures optimal engine performance and avoids unnecessary expenses.