>> Well, yes. And the terrain and so on. But remember, I drive the same 
>> route every day, at approximately the same speed. Driving along the 
>> motorway really is drastically more efficient. (Except the M45; that's 
>> uphill.)
> 
> Assuming you don't drive faster than 70mph or so, the most important 
> factor is how often you brake.

Yeah. In a town, every 200 yards you arrive at yet another junction. ;-)

>> What I *have* measured is that for the past several weeks, my fuel 
>> efficiency has been slowly decreasing. I recently had the car serviced 
>> (it was overdue) and it's gone up somewhat, but it's still not quite 
>> as high as it used to be.
> 
> Could be any number of things, air temperature, clogged air filter, 
> leaky exhaust, old oil, tyre pressures, how often you use 
> headlights/heater/heated windscreen.

Well, the service involves replacing the air filter, oil filter and oil, 
as well as checking all the tyre pressures.

Maybe it's just because it's winter?

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