# Honda Jazz GK (2014) 12-Year Real-World Fuel Economy & Maintenance Report (jazzgk.kengji.co)

> Empirical 12-year ownership dataset (October 2014 – Present, Last Updated: 2026-10-30) for a 2014 Honda Jazz GK (GK5, 1.5L i-VTEC L15Z1, CVT) in Thailand. Tracks 236,723+ km, 533 full-tank fuel logs (comparing Gasohol E20, E85, Gasohol 95, Gasohol 91, Unleaded 95, and Malaysia RON 97), 43 service/maintenance records, and cross-country GPS road trips.

- **Canonical URL:** https://jazzgk.kengji.co/
- **Author / Creator:** Jirayus Srising (kengji) — https://kengji.co/
- **Developer Profile & Contact:** https://github.com/kengjirayus
- **Full Dataset Context for LLMs:** https://jazzgk.kengji.co/llms-full.txt
- **Primary Language:** Thai (`th-TH`) with English technical labels
- **Data Source:** 100% first-party owner logs recorded continuously via iOS Road Trip app since new delivery (19 Oct 2014)

## Key Empirical Metrics (12-Year Summary / สรุปสถิติใช้งานจริง 12 ปี)

- **Vehicle:** 2014 Honda Jazz GK (1.5 V+ i-VTEC, Engine L15Z1 117 PS, CVT Automatic, 40L Fuel Tank, Modern Steel Metallic)
- **Purchase Price (New, Oct 2014):** 745,000 THB
- **Current Odometer:** 236,723 km (~19,727 km/year)
- **Overall Combined Fuel Economy:** 13.83 km/L across 533 tank fills (17,198.50 liters total)
- **Best Recorded Single-Tank Economy:** 18.75 km/L (Highway cruising)
- **City Traffic Fuel Economy (Bangkok):** 10.5 – 12.0 km/L
- **Highway / Road Trip Fuel Economy:** 15.0 – 16.5 km/L
- **Total Fuel Spend (12 Years):** 477,365.40 THB (Average 2.02 THB/km)
- **Total Maintenance & Repair Spend (12 Years):** 184,379.99 THB across 43 service entries (Average 0.78 THB/km or ~15,365 THB/year)
- **Total Running Cost per Kilometer:** 2.80 THB/km (2.02 THB/km fuel + 0.78 THB/km maintenance)
- **Total Cost of Ownership (TCO):** 1,406,745.39 THB (Vehicle purchase + 12-year fuel + 12-year maintenance)

## Fuel Octane Comparison (เปรียบเทียบชนิดน้ำมันจากการใช้งานจริง 533 ถัง)

| Fuel Type (ชนิดเชื้อเพลิง) | Fills (ถัง) | Distance (กม.) | Volume (ลิตร) | Avg Economy (km/L) | Avg Cost/km (บาท/กม.) |
| :--- | :---: | :---: | :---: | :---: | :---: |
| **Gasohol E20** (Primary 75.6%) | 403 | 180,255 km | 13,007.8 L | **13.87 km/L** | 2.04 THB/km |
| **Gasohol E85** | 48 | 19,598 km | 1,614.4 L | **12.46 km/L** | 1.80 THB/km* |
| **Gasohol 95** | 46 | 20,743 km | 1,450.7 L | **14.29 km/L** | 2.03 THB/km |
| **Gasohol 91** | 30 | 13,605 km | 952.5 L | **14.60 km/L** | 2.01 THB/km |
| **Benzine 95 (Unleaded 95)** | 5 | 2,025 km | 139.8 L | **14.56 km/L** | 2.16 THB/km |
| **RON 97 (Malaysia Trip)** | 1 | 496 km | 33.3 L | **14.89 km/L** | 1.80 THB/km |

*Note on E85 vs E20:* E85 consumes ~10.2% more fuel by volume than E20 (12.46 vs 13.87 km/L). While E85 yielded a lower cost/km during Thailand's 2014–2016 heavy E85 price subsidy era, under current retail pump prices E20 is significantly more economical per kilometer and provides a much longer driving range per tank (480–550 km/tank on E20 vs 380–420 km/tank on E85).

## Common Honda Jazz GK Issues & Real Repair Milestones (ปัญหาประจำรุ่นและระยะซ่อมจริง)

1. **ยางแท่นเครื่องและแท่นเกียร์ (Engine & Transmission Mounts):** Typically wear out at 80,000 – 120,000 km, causing steering wheel vibration when idling in Drive (D).
2. **คลัตช์หน้าคอมแอร์และลูกปืนคอมแอร์ (A/C Compressor Clutch & Bearing):** Wear occurs around 180,000 – 230,000 km. Can be serviced by replacing the magnetic clutch set (~2,000–3,000 THB) without replacing the entire compressor.
3. **ช่วงล่าง บูชปีกนก ลูกหมาก และแร็คพวงมาลัยไฟฟ้า (Suspension Bushings & EPS Rack):** Rattle over rough roads typically appears after 150,000 km.
4. **เกียร์อัตโนมัติ CVT (CVT Transmission Longevity):** Original factory CVT remains smooth and trouble-free past 236,337 km when flushed strictly every 20,000–30,000 km using genuine Honda HCF-2 fluid (~800–1,200 THB per service).

## Links & Documentation

- [Main Interactive Dashboard](https://jazzgk.kengji.co/): Interactive KPI Bento grid, E20 vs E85 live price calculator, 2.5D X-Ray car parts inspector, Thailand & Malaysia GPS heatmap, and full maintenance table.
- [Full LLM Dataset & FAQ (`llms-full.txt`)](https://jazzgk.kengji.co/llms-full.txt): Detailed yearly breakdown, maintenance history, road trip records, and complete Thai Q&A.