Tesla Model 3 Road Trip to Germany, Part 3: Does Driving Fast on the Autobahn Really Save Time?

This is the last leg of my Tesla Model 3 road trip from northeastern Romania to Cologne, Germany. After a night sleeping in the car somewhere in Austria, I still had almost 900 km to go, most of it on German highways. I set myself two goals: let the car plan my charging stops, and find out, with the clock running, whether flooring it on the unrestricted sections of the Autobahn actually gets you there sooner. Every number below was read from the car's screen or the charger, and you can see it all in the video on the "Mașina Timpului" channel.

Video

Watch on YouTube

Morning in Austria after a night in the car

I woke up around 5:00 a.m. after going to sleep at about 9:00 p.m. With the rear seats folded, a gym mat, an old duvet and a sheet, the roughly 1.80 m (5'11") of flat space was just enough for me. I left the car in Camp Mode at 24°C (75°F), and the warm air reached everywhere, including my feet. I could sleep on my side or on my stomach without any trouble.

By that point I had covered 1,263 km from home in about 15 hours of driving. While I grabbed a coffee, I charged for 18 minutes at an IONITY station right next to the highway, started through the Electroverse app, up to 80%.

What the car suggested

At 80%, Tesla's trip planner showed 2 hours and 46 minutes to the first stop in Germany, followed by three short sessions of 9, 10 and 17 minutes. For me, the sweet spot on a long trip is about three hours between stops at a steady 120 km/h (about 75 mph).

My average since leaving home was 141.8 Wh/km after roughly 1,380 km, a bit higher than usual. My guess is tire pressure. I was running 2.7 bar, while I normally leave home at 2.9 and see it climb to 3.0 or even 3.1 on the highway. I didn't measure the effect separately, so treat it as a hypothesis. I was also testing aftermarket aero wheel covers instead of the originals, and I felt no vibration, even at higher speeds.

The speed myth: how much time do you really gain?

The first part of the day was full of 80 km/h work zones and heavy traffic on the Linz bypass, so my average was about 110 km/h. Once in Germany, on the sections with no speed limit, I drove as fast as traffic allowed. According to "ADAC", the advisory speed on the Autobahn is 130 km/h (about 81 mph), even where there is no mandatory limit.

The result made me laugh. When I entered the charging station in the navigation, the arrival time was 9:15. After running at 150 to 160 km/h (93 to 99 mph) wherever I could, it dropped only to 9:13, then to 9:10. That's about five minutes saved over roughly 300 km. Trucks passing each other, roadworks and cars cruising at 100 to 110 km/h slow you down anyway. Over the last 15 km of hard driving, consumption jumped to 212 Wh/km, and the predicted arrival charge fell from around 10% to 1%.

For the whole stint, about three hours of driving, I used 52 kWh at an average of 147 Wh/km. My takeaway: high speed means more energy, more stress and more concentration, all for a few minutes.

Charging above 220 kW and a green sticker

I rolled into the Supercharger with 1% and wasn't worried at all. The battery hadn't been preconditioned, but the fast driving had warmed it up naturally. Power climbed to 220 to 230 kW, something I hadn't seen in a long time. According to "Tesla Romania", the Model 3 can Supercharge at up to 250 kW.

In the station shop I bought the German low-emission zone sticker (Umweltplakette) and stuck it in the lower corner of the windshield. According to "TÜV NORD", the sticker is required to enter low-emission zones in German cities. I stayed 20 minutes, not because the car asked for it, but because that's what I needed.

Skipping a suggested stop, no problem

The car wanted me to stop again after about 100 km. Instead I chose a station 230 km away, where the estimate said I'd arrive with 0 to 2% at 120 km/h. I arrived with 5%, after 229 km in 2 hours and 5 minutes. Battery preconditioning started on its own 11 minutes before arrival. Tesla's estimates felt slightly conservative to me: stick to the legal speeds and you arrive with a bit more charge than predicted.

At that site, which had Superchargers, IONITY and other chargers, power again reached 227 to 231 kW. I stayed 25 minutes with the limit set to 70% and had lunch in the meantime. By my own math, based on my consumption over the previous 300 km, that added enough energy for about 300 km of driving.

A camouflaged prototype and arriving in Cologne

On the final stretch I followed a fully camouflaged prototype SUV for a while, with dark windows and Polish plates. I think it was a Zeekr, but I couldn't confirm it. It was being tested at various speeds and had a fairly soft suspension.

I arrived in Cologne exactly at the time the car predicted at the last charging stop. The final leg was 263 km in 2 hours and 34 minutes at 141.3 Wh/km. For the whole trip from home: 2,125 km, 23 hours and 38 minutes of driving and an average of 142.7 Wh/km, very close to the 140 Wh/km reference line on the car's energy screen.

What it means for drivers

• Speeding on the Autobahn buys you very little time. I saved a few minutes over 300 km while using much more energy.
• Tesla's trip planner is a starting point, not a rule. You can skip a stop if you know your driving, and the arrival estimates lean conservative.
• A warm battery charges fast. I consistently saw more than 220 kW, even without preconditioning.
• Check tire pressure before a long trip. In my experience, a few tenths of a bar can show up in consumption.
• Driving into German cities? Get the green sticker. Some highway service stations sell it.
• Sleeping in the car is a real option. With Camp Mode and a little gear, you can take a long break without a hotel.

If you missed the earlier episodes, read part 1, through Romania's mountains, and part 2, from western Romania to Austria.