Some people are surprised to find that different petrol stations charge different prices. It's true!
And some people pay more than they need to to fill up the car, just because it's such a fag to go from station to station.
But it does pay to shop around. Over Easter I replenished the car at a well known supermarket for 138p per litre of diesel.
Then I found myself in rural Wales, paying 144p. That's nearly £4 more for my tank.
Petrolprices.com gives you an idea, for free, of what's available in your area. In these volatile times, it's easy to lose track of what a keen price might be.
How high have you seen prices go? And any tips on how to deal with it?