What is the real cost of fuel?

January 19, 2021

5 min

What is the real cost of fuel?
If I told you that your cost price was potentially a whopping 17ppl (77cpg) different from what you thought it was, how would that impact your pricing decisions?
Just how important are cost prices to you?

Typically we find that retailers look at three metrics to set their street prices:

Volume, Cost price/margin, Competitors

The order in which each retailer values these metrics vary. For example, if your stations are in highly competitive areas this order tends to be:

Competitors, Volume, Cost price/margin

In area with low competition and high affluence, the order might change to:

Cost price/margin, Volume, Competitors

However, all three should be equally important when making the most important daily decision in your fuel business. This is because they not only influence your profit but can also influence each other.

So, what really is a ‘cost price’?

Seems like a silly question, but there are many ways to work this out:

Replacement cost

Essentially costing all the fuel in your tank against today’s price on the basis that you are going to have to replace that fuel anyway. And this has some benefits; not only is it the easiest number to capture but it allows you to keep a close eye on where the market is heading.

The problem is that by not taking into account the cost of deliveries that came yesterday or before, you could be getting a totally different margin than the one you expect.

Here is the trend of the replacement cost averages for our UK customers over the last 100 days. Notice the heavy drop:

Graph showing why the trend of replacement cost averages for UK customers is sloping downward

Based on this, you believe you are selling very cheap fuel and it’s why many retailer’s prices have shot down over the last week or two. In reality, you are still selling at the cost of your last delivery, which brings us to...

Last delivery cost

In this method you are always using the cost of your last delivery to price fuel. Whilst this is a bit more work (often keeping track on a spreadsheet) and is usually only possible for smaller estates, it probably makes more sense that the replacement cost option.

Whilst less of an issue than replacement cost, you will rarely have only one delivery worth of fuel sitting in your tanks (especially when the market is cheap). This means you are still not taking into account the oldest fuel sitting there, that you are selling at a potentially higher or lower cost. You can get around this by using FIFO.


FIFO (first-in-first-out) is a great method as it will typically match your accounting practices. It is tracking what fuel comes in and what is leaving, applying the volume leaving to the oldest delivery. This means you can see, for example “I have 3000 liters at 89ppl and 5000 liters at 92ppl. I can hold my price for 3000 liters and then need to change”,

It is probably only possible to track FIFO at the end of each day with spreadsheets, although pricing software such as that offered by PDI are able to provide real-time FIFO view.

This method also leads to big jumps in cost prices and margin as it is what we refer to as ‘stepped’. This means that whilst you are able to make sure your margin is as desired your pole price may be taking sharp, large moves which can be irritating or confusing to consumers.

Blended cost

This may come across like we are plugging EdgePetrol, but hey, we are. As the market has got volatile check out the growth in our usage, up over 50% since the start of the year: 

Graph showing vast increase of EdgePetrol usage in a very short amount of time

This is not a coincidence. One of thee reasons for this is in a more volatile market it is very hard to know whether or not you are making margin on the fuel you are selling. Regarding replacement or last delivery costs, we have seen up to 17ppl (77cpg) between this and the blend of fuel in your tanks. Usually this ranges between 0-4ppl (0-18cpg) which is still pretty huge!

So what does 'blended' mean?

By applying the cost price to each delivery that lands, the cost prices weight and blend based on the fuel currently in the tanks. When fuel is removed by customers this is removed from the oldest delivery and reweighted for each transaction.

Remember the graph from earlier showing average replacement cost? Let’s lay over the average blended cost and see what we get:

A graph showcasing the fact that there are differences between average replacement costs and average blended costs

What you’ll notice is that whilst in the months leading up to the drop in prices replacement cost and blended cost are never perfectly aligned, blended cost varies between being cheaper or more expensive depending on whether the market is in backwardation or contango. In other words, the blended cost is the most accurate method of tracking the real movement of cost prices.

Once we hit the drop in prices, there is a smoother more realistic view of the cost of fuel in your tanks using the blended method. This is more obvious if we only take the last 20 days:

A graph showcasing that the blended method used by EdgePetrol to calculate real cost of fuel is the most precise available

Using this methodology has allowed EdgePetrol users to maintain a steady margin and stay profitable in these uncertain times.

“So what if I know my cost price, I always follow my competition?”

This is common logic of retailers and it’s true, sometimes you have no choice but to follow the competition. Most retailers with large portfolios will have at least a handful of stations that are heavily sensitive to pricing. The key is to take the margin at the stations you can when you can.

This is why we believe accurate cost prices are so important. In order to know when you can afford to follow and when it may be time to lead up, you have to have a real handle on that margin number.

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