

The Stats:
- The Core Stats:
- Total Distance: 111,368 miles
- Total Fill-ups: 481
- Total Expenditure: $9,000.70
- Lifetime Average: 35.82 MPG
- Personal Best: 43.90 MPG (Worst: 25.50 MPG)
- Average Cost per Fill-up: $18.71
Analysis & Insights:
- Zero Mechanical Degradation: Despite the car being nearly a decade older since the start of the log, the efficiency trend line is actually up by 0.55 MPG. No loss in performance with age.
- Station Reliability: Wawa (207 visits) and Exxon (152 visits) account for the vast majority of the data. Despite brand marketing, there is no statistically significant difference in fuel economy between them (both hover around 35.5–35.9 MPG).
- Seasonal Cycles: Data shows a clear cyclical pattern where efficiency peaks in the summer months and dips during winter, likely due to winter fuel blends and colder operating temperatures.
Tools used: Gemini for analysis and visualization. Data tracked manually Simply Auto app.
Posted by Verdnan
![[OC] 9 Years and 111,000 Miles of Fuel Data: Toyota Yaris (2017–2026) [OC] 9 Years and 111,000 Miles of Fuel Data: Toyota Yaris (2017–2026)](https://www.byteseu.com/wp-content/uploads/2026/02/820a8j8vkcjg1-1024x512.png)
3 Comments
**The Stats:**
* **Total Distance:** 111,368 miles
* **Total Fill-ups:** 481
* **Total Expenditure:** $9,000.70
* **Lifetime Average:** 35.82 MPG
* **Personal Best:** 43.90 MPG (Worst: 25.50 MPG)
* **Average Cost per Fill-up:** $18.71
**Analysis & Insights:**
* **Zero Mechanical Degradation:** Despite the car being nearly a decade older since the start of the log, the efficiency trend line is actually up by **0.55 MPG**. No loss in performance with age.
* **Station Reliability:** Wawa (207 visits) and Exxon (152 visits) account for the vast majority of the data. Despite brand marketing, there is no statistically significant difference in fuel economy between them (both hover around 35.5–35.9 MPG).
* **Seasonal Cycles:** Data shows a clear cyclical pattern where efficiency peaks in the summer months and dips during winter, likely due to winter fuel blends and colder operating temperatures.
**Tools used:** Gemini for analysis and visualization. Data tracked manually Simply Auto app.
Very impressive. Fuel efficient cars can be produced at reasonable prices that last a long time without losing significant performance. I don’t know why we need to be pushing 6,000lb EVs at everyone
Any idea why mpg would rise over time?