I guess when i get my LS back from the painters, i'll do some serious mpg road tests and get to the bottom of it.
I'll bet i'll get nothing like 8.2L per 100km... it'll be more like 12L per 100km.... thats my gut feeling anyway...
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Ahhh, the "distance to empty" readout ... I've never known one of those to be accurate in any car. Reset your trip meter, drive exactly 10 km and you'll probably find the distance to empty hasn't changed from 650 km. Shouldn't it change to 640 km? Well, I bet it won't.
I believe the readout is meant to be a very, very conservative guide ... which is a nice thing if you're about to head from, say, Adelaide to Perth. You wouldn't want it to overstate your range when there's no petrol stations for hundreds of k's!