MPG
Posted: Tue 7 April, 2009 Filed under: Domestic, Driving, Geeky 3 Comments »I don’t see that this post will mark me as anything other than someone with a mild form of OCD, but here we go anyway.
My car has a trip-computer thing with a small number of functions on it – MPG, average speed, miles left in tank, outside temperature, and something else. I normally leave it on MPG, and over the last few months I’ve been building it up, finding what revs/speed works best for mileage, that kind of thing. Like I said, slightly OCD, geeky as hell, but well, that’s me for you.
Anyway, in the last week, I’d got it to click up to 49.0MPG on the monitor. I’ve no idea whether it’s a real figure, or just an arbitrary “kind of around that figure” thing. I don’t care either way. I was more than slightly pleased (in a quiet kind of way, because I know this entire thing is epically sad anyway) to have got the car – which is coming very close to the 100,000 mile mark – to be doing 49MPG still.
But over the weekend, the fucking thing reset. No idea why – I started the car up, and clonk, mileage down to 19.1MPG, all the other bits reset, trip meter reset. And I can’t deny, I got quite annoyed by it.
I know, it’s sad, geeky and lots of other epithets. That’s just me. And I get annoyed when things let me down.
Still, I’ll go back to building it back up again, see if I can replicate the problem…
Firstly, it’s not OCD. Or, if it is, I have it too. *thinks* erm….
IME engines (especially diesel) do several more miles to the gallon as they get older.
If you’re monitoring mpg, you really need to reset it every time you fill up, otherwise it’s not a true reading. As you’ve found.
Mr BW tells me off when I drive the Clio (which he mostly uses) as I frequently end up with the mpg dropping below where he’s left it (usually somewhere around 60). In the 206, though, I get more mpg than him.
Most odd.
I though the MPG on these trip computers was only calculated on the last 30KM travelled. (thats what it says in my handbook)
I don’t think that’s the case on mine – it could be, not having read the manual in a while, but I don’t think so.
After all, if it were, I’d think the MPG figure would change far more rapidly than it actually has done while I’ve been following it.