1. Introduction
Tesla’s refreshed Model Y (Juniper) promises several improvements, including better efficiency. But does it actually deliver?
In a real-world highway range test, we compared the 2025 Tesla Model Y (Juniper) against the 2024 Model Y (pre-refresh) and an older 2021 Model Y.
The results? Surprising.
2. Test Setup & Methodology
To ensure accurate comparisons, all vehicles were:
Same battery pack (Panasonic 82 kWh)
Dual Motor Long Range configuration
Identical wheel setup (Aero wheels)
Same test conditions (70 mph, same wind, same HVAC settings)
Key Differences:
New Model Y (Juniper) – ~500 miles (brand new)
2024 Model Y – ~10,000 miles
2021 Model Y – Higher mileage, different tires
3. Key Findings: Efficiency & Range Comparison
Range Results
Model |
Miles Driven |
Efficiency (Wh/mi) |
Battery Used |
|---|---|---|---|
2025 Model Y (Juniper) |
298 |
275 |
82 kWh |
2024 Model Y |
282 |
271 |
77 kWh |
2021 Model Y |
244 |
- |
- |
Observations:
The new Model Y went farther (298 vs. 282 miles) but only because it had more usable battery capacity.
Efficiency was worse (275 Wh/mi vs. 271 Wh/mi) despite Tesla’s claims of improvements.
4. Possible Reasons for Efficiency Differences
Why was the new Model Y less efficient?
1.Tire Break-In Period
New tires (especially performance-oriented ones) lose 5-10% efficiency in the first 500 miles.
The 2024 Model Y had ~10,000 miles, meaning its tires were fully broken in.
2. Wind & Testing Conditions
While all cars faced the same wind, the Juniper’s aerodynamics might handle crosswinds differently.
3. Battery Degradation
The 2024 Model Y had ~5 kWh less capacity due to degradation.
If both cars had identical fresh batteries, the old Model Y might have gone farther.
5. How This Compares to Other Tests
Other testers found mixed results:
William (Norway): Old Model Y was more efficient.
Only Electric (Side-by-side): New Model Y slightly better.
European Test: New Model Y better at low speeds, worse at highway speeds.
Conclusion: The difference is minor, but highway efficiency may not have improved.
Final Verdict: Is the New Model Y More Efficient?
No significant highway efficiency gains over the previous Model Y.
Range increase comes from battery capacity, not efficiency.
City driving might show improvements (due to better glass coating & HVAC).
Should You Upgrade?
✅ Yes if you want better comfort, cooled seats, and styling.
❌ No if range & charging speed are your top priorities.