My fuel pump is (finally) scheduled to be replaced next week.

OK, just got around to having a close look at my fuel economy.

I've now clocked just shy of 4200 km (about 2600 miles) and the instrument cluster is showing an average fuel economy of 12.4 l/100km, or just over 19.1 mpg (US gallons). I estimate that about 30% of this was city driving.

The period-to-period fuel economy function available from the touchscreen shows quite a variation - from about 10.7 l/100km (22 mpg) to about 13.2 l/100km (17.8 mpg).

I say about because (as I'm sure you've all discovered), exact readings are not available from that function. Results are only depicted as a bar graph and the best you can do is estimate. Would it really have cost Infiniti that much to build a complete function that saves/displays for each interval, the starting odometer reading, number of miles/kms travelled and the calculated economy value (or fuel amount used)?

Interestingly, I've achieved better fuel economy from 87 octane in my last 3 tankfuls than my first 4 or 5 fillups, using 91 octane. I realize this isn't enough data from which to draw any firm conclusions and I did anticipate better fuel economy as the engine components loosened up, but just the same, this was unexpected.

Cheers,
David