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Originally Posted by monkeynuts
Hi everyone...
This is a very interesting thread. I have a 163bhp 320d on around 50K and am interested in more mpg + more performance (who wouldn't be).
From reading this and other posts, I have a few questions:
1) I'm intrigued how the 'economy mode' works. If I'm doing 70mph and it's currently running at 50mpg on the flat, how can the spider effectively achieve the same power with less fuel (and therefore higher mpg)? This sounds like magic and wizardry to me!
2) If it produces more power by fooling the ECU into pumping fuel in at a higher rate, presumably when it's in 'power mode', the mpg must go right down - so the 'economy mode' must be quite amazing to offset this right?
3) A couple of posts suggest the Spider can cause the OBC to miss-calculate the average MPG. Can anyone confirm whether the real-world MPG (ie how many miles done on a full tank) is actually any better?
4) Has anyone had one of these on for a while and has it been probelm free?
Never considered anything like this before so am being extra cautious! My main interest is greater MPG because as with any car I’ve ever had, any power boost only gives any satisfaction for a couple of weeks and then you always want more!
Also, on mine, when I picked it up from the Dealer, it showed 51mpg on the OBC. I left it untouched for a few days and it didn't budge (suggesting it had been accumulated over time). After reseting, I can't get more than 41-42mpg! I guess the previous owner either had a Spider on it or had a very light foot!
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hi i have the same car as you 163 he must of been on the motorway at 65-70 to get 50+ i do reset around towns and get 38mpg keep flooring it, then on motorway at higher speeds if you know what i mean 44mpg