The phrase 'gasoline price' nearly always refers to the general sense, simply because that's how people interpret it.

To talk about 'the price of gasoline' or 'gasoline prices' or 'the gasoline price' or 'prices of gasoline' or however you can mess around with the phrase will almost always mean the general sense.

To make it specific, you can apply some context:

The price at gasoline at this shop.

 

These gasoline prices.

Giving some context or location makes the phrase more specific, but otherwise it will be assumed you're speaking generally.

I don't know why this came about, but I'd put money on assuming 'gasoline prices' are just that fun to talk about that the phrase became a household topic.

The phrase 'gasoline price' nearly always refers to the general sense, simply because that's how people interpret it.

To talk about 'the price of gasoline' or 'gasoline prices' or 'the gasoline price' or 'prices of gasoline' or however you can mess around with the phrase will almost always mean the general sense.

To make it specific, you can apply some context:

The price at gasoline at this shop.

These gasoline prices.

Giving some context or location makes the phrase more specific, but otherwise it will be assumed you're speaking generally.

I don't know why this came about, but I'd put money on assuming 'gasoline prices' are just that fun to talk about that the phrase became a household topic.