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Case study · BYD Sealion 6 · Cavite, PH · Dec 2025 – Mar 2026

PHEV running cost — the first three months of tracked driving

Owned since September 2024; consistent refuel-by-refuel tracking started in December 2025. This covers the 5,123 km logged so far (Dec 2025 – Mar 2026) — a slice of the ~27,500 km lifetime odometer — with odometer- and meter-tracked efficiency, electric-vs-fuel running cost, usage split, and battery health for a BYD Sealion 6.

  • BYD Sealion 6
  • Plug-in hybrid
  • 5,123 km tracked
  • 63% EV usage
  • Cavite, Philippines

Read the full report →Download raw markdown ↓

The short version: 63% of the driving was electric, the combined figure landed at 6.0 L/100km, and electric kilometers cost about half what fuel kilometers do (₱2.51 vs ₱4.81/km). What surprised me was how little the headline efficiency means on its own — the real variable is the EV/HEV split, which is a function of charging access and discipline, not the car. Your numbers will move with where you can plug in, not your right foot. The home charging behind this is solar-fed; that side is written up separately: Residential solar performance.

Headline numbers

Combined efficiency
6.0 L/100km

beats the 8–10 L/100km class benchmark

EV running cost
₱2.51/km

vs ₱4.81/km on fuel — 48% cheaper

Saved vs ICE
₱10,900

≈355 kg CO₂ avoided so far

Battery health
99% SOH

after ~31 charge cycles

What the data shows

The split between electric and fuel driving has been consistent at roughly 63% EV cumulatively, rising to 72% in the most recent tank. EV kilometers cost ₱2.51 each against ₱4.81 on fuel, so every kilometer shifted onto electric saves about ₱2.30 at the current tariff and ~₱55.75/L pump price.

Combined consumption of 6.0 L/100km comfortably beats the 8–10 L/100km benchmark for mid-size SUV PHEVs and undercuts a comparable ICE SUV by roughly 38–45% on running cost. Fuel efficiency holds steady at 8.3–8.6 L/100km and EV efficiency at 5.4–5.7 km/kWh — no anomalies in the tracked sessions.

Battery state of health is 99% after ~31 charge cycles, and the next scheduled service lands at 40,000 km, roughly Q3–Q4 2026. See recommendations →

Cumulative cost & efficiency

ModeDistanceFuel / energyEfficiencyCost/km
HEV (fuel)1,919 km165.52 L8.6 L/100km₱4.81
EV (electric)3,204 km562.0 kWh5.7 km/kWh₱2.51
Combined5,123 km—6.0 L/100km*₱3.37

*Combined efficiency converts EV cost into equivalent fuel liters. Total spend so far is ₱17,277 over 5,123 km.

Full analysis · trends · anomalies · projections →

Disclaimer: the report is AI-assisted. Efficiency, cost, and usage figures are derived from odometer and meter readings entered by hand, so accuracy depends on those inputs. Values are for personal tracking and should not be used for warranty claims, tax filings, or official reporting without independent verification.

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