I guess it must be a case of more power/torque at lower revs - more fuel per rev but at a lower frequency - net effect (if driving normally) is less fuel used.
Whatever the case, if you're filling up less often then who cares I suppose!
I'm gonna let it lie now!
Think I'm going to upgrade my Stereo with the Alpine kit first (after reading robbie99's post on the subject), then maybe i'll go for the Spider...
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