We’re over 20,000km on the 2006 Pontiac Vibe now and the gas mileage is getting better. Even with the warmer temperatures and use of the air conditioning a fair bit our average gas mileage is 8.29L/100km (or about 28.4mpg if I did the math right) over about 18,000km. We’ve been tracking the Pontiac Vibe gas mileage since we bought the car and we keep entering the data into a spreadsheet. Makes it really easy to see how various things affect the gas mileage.
Currently the worst gas mileage we have gotten with the Vibe was 9.5L/100km (24.7mpg) (in mid February) and the best gas mileage was 7.1L/100km (33.1mpg) (in mid May and June). I also track a 5 fillup trend in my spreadsheet which makes it a little bit easier to see seasonal gas mileage. For example, the 5 fillups to the end of February averaged 9.0L/100km where as the 5 fillups to the end of June averaged 7.4L/100km.
If I ever get around to it, I’d like to put all of this information online as it’s very difficult to find real world gas mileage information. Since I’ve been tracking for all of my vehicles, I think it might be of use to someone in the future who is looking for more realistic numbers than what the window stickers say.
Oh, in case you’re wondering, this is a base Pontiac Vibe with an automatic transmission, air conditioning and cruise control. Almost all (90% minimum) of the driving would be considered highway driving. The car typically goes 50+ km one way to work 5 days a week on secondary roads (80km/h speed limit). It sees on average another 150km additional highway driving on the weekends (on 400 series highways in Eastern Ontario).