Suppose you don't want to fill your car up .... suppose you only want to gas up ( meaning a specific amound of petrol, eg 30 liters worth of petrol). How to explain that to the gas station attendant/assistant? Your example monologue, please?

Also, will one be understood at a typical US/UK gas station if he/she says "liters, not "gallons"?

Hope my questions make sense...

Thank you in advance!

MUSCOVITEa specific amount
-- Five gallons, please. (Not liters. USA)

But where I live most people use self-service stations. You can use a credit card, so you never speak to anyone. You just drive up, make your transaction at the credit-card machine, and pump your own gas.

If you don't use a credit card, you note which number pump you'll be using (say it's pump 5), go up to the attendant, hand them your money (say it's $20), and say, for example, "20 on 5 please". Then you go back to your car and pump the gas yourself. It will stop automatically as set by the attendant when it has pumped $20 worth of gas.


Where I live, 'gas up your car' means 'fill the tank'.

I haven't been to a gas station with an attendant for many years. All the gas stations I visit are self-service.

But if I had to, I'd say eg 'Put in ten dollars' worth of regular, please'. No need to specify either litres or gallons.

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Gas is sold by the gallon in the US. We get soda by the liter, and that's about it. Most gas pumps are designed so that they can be set to deliver a certain dollar amount and then stop. I always just say how much money I want to spend, because a temporary lack of pocket money is usually the reason I'm not filling it, anyway: "Give me ten dollars of regular, please."
 Clive's reply was promoted to an answer.
Understood. Many thanks!
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 CalifJim's reply was promoted to an answer.