Couple of things, did any of you guys realise that the Maserati Trip computer is in Miles to the US Gallon not the imperial Gallon? Page 111 "Average Fuel consumption" of your Maserati Info Centre booklet refers. A US Gallon is 20% less than a UK gallon, therefore if you see 20mpg you are actually doing 24mp(imp)G.
Also I might have some news on the NIT discs, I found a website with Alfa/Fiat/Lancia links that might work on Maserati's. Give me till tomorrow I need to burn a disc and test it out...
A US gallon is smaller (can you believe it) than a UK gallon:
US gallon: 3.78 litres
UK gallon: 4.55 litres
The 4200 trip computer is based upon US Gallons:
Thus you have to multiply your MPG (based on US gallon) by 1.2 so Andrew, your actual MPG is 17 mpg
X1ons you are 21.5 mpg actual
My 4200 trip computer is based on Imperial gallons. As I've explained several times before on both this forum and the other one, it is easy to check by changing the displayed units from mpg to l/100km. I've checked mine again earlier today and it displayed 19.8 mpg and 14.3 litres/100km. If it displayed US gallons, the trip computer would show 16.4 mpg.
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I wouldn't put too much faith in the Italian computer; by changing from Imperial to metric the travel time and range have changed too. How does that work? Are metric minutes different from imperial minutes? If so, I must have been off school the day they told us that!