Tesla Model Y Efficiency: New Juniper vs. Previous Gen – Real-World Test Results

MaR 28,2025

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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.