Something rather weird happened with my 2002 Jeep Grand Cherokee. After the starter motor blew out late last year, I got a brand new one fitted from the dealer. Then over the winter, my fuel consumption started dropping dramatically. As stated by the trip computer, it went from hovering above 17 litres/100 km down to as low as 15.5 litres/100 km, all without any change in driving style. One could attribute this to many other things, like winter weather or a dying trip computer, but neither can be proven definitively. This wasn’t my first winter with the Jeep, and the trip computer seems to be otherwise working fine.
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