Don’t Let the Pump Scam You

by | Jul 17, 2025

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As I mentioned earlier this week, I’m driving 1,300 miles cross-country to Colorado to visit family for the next 10 days or so — but I didn’t want to leave you empty-handed.

Especially after the gas horror show I told you about a few days ago (diesel at year highs, gas up 8.8% while crude’s down 7%)… I figured this article might be worth revisiting.

It’s a little trick I use to figure out if gas prices are fair — or if the local station is trying to take me for a ride.

I first shared this back in November… but it’s just as relevant today, maybe even more so:

The Trick I Use To Find Fair Gas Prices — And Spot When Stations Are Overcharging

When it comes to the gas pump, there’s a trick I’ve relied on for years to make sure I’m not paying more than I have to.

It’s saved me plenty of times, though there are moments when even a “fair price” can feel out of reach.

For example, during the pandemic, every station I went to had gas marked around $3.20 — sometimes even higher.

That was way above what the fair price should’ve been based on my formula.

I knew I was overpaying, but with every station charging about the same price, I had to pay it.

That experience reminded me that, while I can’t control prices, at least I know when they’re fair and when they’re not.

In any case, the trick is simple:

I take the last price of gas futures (t and add the taxes here in Mobile — around 56 cents per gallon. When the pump price is close to that number, I’ll fill up. But if it’s way over? I know I can hold off or look elsewhere.

For those of you who want to give it a try, you can do this by looking up the gas futures price and adding your state and local taxes.

The current gas futures contract is /RBZ24, but that will be expiring soon, so you could also use the continuous ticker /RB which will roll over to the latest contract.

If the price at the pump is within 5¢ to 10¢ of the futures price plus your state and local taxes, you can go ahead and fill up, confident that the price you’re getting is a fair one.

Anything higher than that and you might want to think twice — unless we have another pandemic-like situation that is. Sometimes it’s a seller’s market.

For users of Tom Busby’s Roadmap software, here’s the code I use to automatically calculate this for me:

SetLength(3);

SetBucket(.5631,0);

GetValue(/RBZ24,Schwab,Last,1);

Add(0,1,2)

Update(GAS-PRICE,Schwab,Last,2)

If you don’t use Roadmap, it’s just as easy — just take the futures price, add your state and local taxes and look for a price at the pump within 10¢ of that number you come up with.

It won’t change what the stations charge, but at least you’ll know if you’re paying a fair price.

Stay sharp, and don’t let those pumps take you for a ride!

Stay sharp,
— Geof

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