Elon Musk wants Tesla Inc. (NASDAQ) to become an autonomous-driving powerhouse, , but the company’s Robotaxi service covered roughly 700,000 paid miles in the second quarter. That’s down about 36% from approximately 1.1 million miles in the first quarter, according to Tesla’s reported figures.

Still, the service expanded across more U.S. cities, accumulating driving data specific to its purpose-built Cybercab so it can roll out more vehicles on the road.

That makes the latest growth in Tesla’s broader software ecosystem particularly interesting.

Tesla’s Robotaxi Future Is Taking Time

Robotaxi is supposed to be one of Tesla’s biggest long-term growth engines. But the second quarter mileage decline shows why investors may have to wait before autonomous rides become a major source of revenue.

The company says its Robotaxi service has expanded to additional metropolitan areas, while its purpose-built Cybercab is moving toward production. But scaling an autonomous fleet involves collecting enough real-world driving data, proving safety, and navigating regulatory requirements.

In the meantime, Tesla already has something Robotaxi doesn’t: millions of existing customers.

The Tesla App Is Becoming More Important

Tesla’s mobile app reached 10.8 million monthly active users in July, according to Similarweb data, up 36.8% from a year earlier and 16.5% from June.

The app is also becoming more tightly connected to Tesla’s software ecosystem. Recent updates added self-driving statistics, more vehicle controls and the ability to use Tesla’s app for additional functions. Tesla has also expanded xAI’s Grok assistant inside its vehicles, allowing drivers to control functions such as climate and music through voice commands.

That creates an important distinction: Tesla doesn’t necessarily need to sell another vehicle to increase the value of the vehicles it has already sold.

Tesla’s FSD Business Provides Clearer Example

Tesla ended the second quarter with 1.48 million active full self-driving (FSD) customers, up 56% from a year earlier. More than 55% of new Tesla deliveries in North America included FSD, showing that the company is increasingly attaching software revenue to its vehicles.

Services and other revenue also reached $4.58 billion in the second quarter, up about 50% year over year, with record gross profit and gross margin.

The bigger opportunity, then, isn’t simply Tesla’s ability to sell more cars.

It’s the ability to keep generating revenue from the cars already on the road through software, subscriptions and other services.

Robotaxi could eventually become the much larger prize Musk has promised. But while that business works through its growing pains, Tesla is finding another way to grow: make the existing Tesla fleet worth more.

For investors, that may be just as important to watch as the next Robotaxi mile.

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