I’m assuming this is a Mazda midsize PHEV SUV (dealer wrote “MX” but the plug‑in Mazda SUV line is the CX family). The PHEV drivetrain gives a short all‑electric range for daily errands but relies on the petrol engine for longer trips — if you don’t keep it charged you’ll see petrol consumption rise. Check remaining battery warranty and whether software/recall updates for the hybrid system and gearbox have been carried out.

• Hybrid battery state‑of‑health report / measured EV range (capacity loss shows up early with heavy use).
• Charging socket and cable operation (no corrosion, charging starts reliably at home and public points).
• High‑voltage system service history and any manufacturer recalls or software updates for the PHEV system.
• Automatic gearbox behaviour — smooth shifts with no hesitation or shudder; check for recent transmission service if required by the maker.
• Undercarriage and wheel‑arch condition for signs of corrosion or off‑road damage (SUVs used for towing/rough lanes show wear here).