Walk into any driver group and you’ll find two camps.

One camp lives by dollars per mile. “Nothing under a dollar a mile.” Look at the fare, look at the distance, decide.

The other camp lives by dollars per hour. “I clear $25 an hour or I go home.” Look at the fare, think about the time, decide.

Both camps are smart. Both are right about something real. And both are missing the exact same thing — the same thing missing from the number Uber flashes on your screen.

Here’s the part nobody says out loud.

Dollars per mile and dollars per hour are not two different ways of thinking. They are the same number. There’s just one piece sitting in the middle of them, and almost nobody names it.

Speed.

Look what it does:

Dollars per hour = dollars per mile × how fast you’re going.

That’s the whole thing. Let’s go slow, both directions.

Start with the dollar-a-mile driver.

Make $1 a mile, driving 30 miles an hour. A dollar times 30 is thirty. You’re making $30 an hour.

Take that same $1-a-mile ride out on the highway at 60. A dollar times 60 is sixty. Now you’re making $60 an hour. Same rate per mile. Double the pay. All because you covered the miles twice as fast.

Now crawl through town at 15. A dollar times 15 is fifteen. Fifteen dollars an hour. Same rule. Same “good ride” by the dollar-a-mile test. Less than half the money.

This driver fixed their dollars per mile. Speed moved. Their hourly went from $15 to $60 and they never saw it, because the rule doesn’t look at speed.

Now the exact same story, flipped — the $25-an-hour driver.

They’ve got one rule too: every ride has to pay $25 an hour. So let’s hold that steady and watch the miles move instead.

A ride comes in that’ll take one hour and pays $25. They take it. Good — that’s the number. But how far is it? On the highway at 60 miles an hour, one hour of driving is 60 miles. They just agreed to put 60 miles on the car to make that $25. Divide it out: $25 over 60 miles is about 42 cents a mile.

Same driver, same $25-an-hour rule, next ride — but this one’s slow city driving at 15 miles an hour. One hour, $25, they take it, same as before. But one hour at 15 miles an hour is only 15 miles. Same $25, over 15 miles, is about a dollar sixty a mile.

Look at what just happened. They ran the identical rule both times — $25 an hour, yes or no. And the pay per mile swung from 42 cents to $1.60. Four times the difference. On the cheap one they’re grinding 60 miles of wear and gas into the car for the same money the short one made in 15. They never saw it, because the rule doesn’t look at distance.

(Those are all dollars before you take out what the car costs you — but the point holds no matter how you figure cost. In every case the rule never changed. The thing the rule wasn’t watching changed. And it cost real money.)

So put the two drivers side by side.

The dollar-a-mile driver pinned their miles and let their hours float — so the hourly swings wild and they blame the night.

The $25-an-hour driver pinned their hours and let their miles float — so the per-mile swings wild and they grind the car down without noticing.

They are the same mistake wearing two different hats. Each one nailed down a single number and left the other one loose — and the market yanks on whichever one got left loose, through the single thing neither is watching: how fast they’re actually going.

Now here’s the real point, and it is not a dig at anybody’s math.

You are already using a speed number. Every single ride. You just can’t see it.

“A dollar a mile” has a speed hidden inside it. “$25 an hour” has a distance hidden inside it — which is just speed wearing a different coat. Either way, you’re guessing at the hidden one, in about ten seconds, in traffic, tired, with two more pings stacking up behind the first.

That’s not because you’re bad at math. You can do the math. It’s that you can’t do it that fast, that many times a night, with the most important piece left blank and a car doing 70.

That’s the whole reason I built the app. Not because drivers can’t count. Because the honest number is the full fare measured against the whole drive — every mile and every minute of it — and the app just fills in the piece you can’t see while you’re moving: the real speed, on the real ride, before you tap.

You’re not getting a better rule of thumb. You’re getting rid of the thumb.