[stefanv]

About 80% of my driving is country highway (80km/h, 50mph), and about 20% light city (city of about 200,000).

Yesterday, for the first time since I'd started concentrating on eco-driving (I won't quite call myself a hypermiler yet) two weeks ago, was the first time I needed to do some city driving.

I have the Torque app set up in my car, and I was pleased to find that my city fuel consumption was only marginally higher than my highway fuel consumption on the three previous days. Torque had recorded an average of 6.1L/100km (38.5mpg) for three days of highway, and 6.2L/100km (37.9mpg) for a 15 minute city drive, starting from a cold start (on a warm day).

Note that my actual fuel economy the last few tanks has been somewhat better than this, around 5.6L/100km (42mpg). The Torque app just isn't fully calibrated yet, but the relative comparison between city and highway on the same tank is probably still valid.

It kind of makes sense, since there's a lot more opportunity for improvement in stop-and-go city driving than in a steady cruise on mostly level ground.

By the way, a quick and easy way to convert from L/100km to mpg or vice versa is to divide into 235:

235 / X mpg = Y L/100km
235 / Y L/100km = X mpg