forget all that
1 two different cars
2 different fuel from different fuel stations
3 loan car or demo what ever it was has more than likely had it's head kicked in buy prospective buyers
4 the particulate filter may have been blocked on the demo short journeys no time to regenorate rite
5 it may have just had it's head gasket replaced you know the recall
6 the ecu may have a different map on it it's when cars are new that fiat are constantly updating it to improve things and iron out faults
7 tyre pressures may have been different
8 tyres may have been different
9 brakes might have been seised sitting around at the dealer ship and having it's wheels cleaned with that horrible acid stuff
10 air temperature at the time
11 humidity at the time
there are just so many variables it's easy to account for the 10 percent fuel difference
Forget all that.
I didn't actually say that going up one inch on your rim size was responsible for the 10% difference in fuel economy. I was just saying that Mark Elvin was right in what he was saying.
It is nice if you read posts before replying to them.
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