Sorry, slightly off topic - Barry: what is that on your avartar???
Back on topic - over the last couple of weeks I have been trying various combinations on my commute, to figure out which has the most effect on my fuel consumption:
1. Boot it up to 90-100mph on the motorway, air-con on
2. Steady 70-80mph, no air-con at all
3. Steady 70-80mph, air-con on
4. Boot it up to 90-100mph, no air-con
Week 1, I got 30mpg. Week 2, I got 34mpg. I'm currently on week 3, but it looks like it will be about 30mpg. On this information, I reckon I will get nearer 34mpg on week 4.
Looks like the air-con may be the main factor on my commuting run (a mixture of 30% single lane B-roads, and 70% dual carriageway). Having said that, I did a run up to London (90% motorway) at a steady 85-90 mph, and achieved 36mpg over the whole weekend.
- urban driving makes a big difference
- air-con makes a big difference
- going a week without air-con is hell
- the car feels GREAT at 100mph
The things we do in the name of science.....