So, as another newbie here who's read your post with interest, if I may - welcome back!
I bought my ES manual to have an economical car, one that could get great economy, but would always get reasonably good economy (and I saw only 74bhp as an advantage).
And I've spent the time so far playing at trying to see how good I could get it. After 2 tankfuls of 45 and 46 mpgUS, and having seen on display A a max of somewhere in the 57s, I thought I wouldn't see any better, and I wondered if I could ever get numbers in the 60s and 70s as some people in the logs get.
So yesterday I'm driving along a country road, about 40mph, no different conditions than I've seen before, and the A Gauge is reading 64. Never seen that before!
I have delved deeply into the code used in the ECUs of Ford trucks of the 1990s, and I know thay have an alternate calibration, and I'm told it is used for the initial miles of a vehicl's life. My total miles at that point was about 1030, so now I'm wondering if Mitsubishi has such a thing as well.
So it may not be possible to get the best ecocnomy early on in the car's life, completely aside from issues like mechanical parts "loosening up"!
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View my fuel log 2014 Mirage ES 1.2 manual: 46.0 mpg (US) ... 19.5 km/L ... 5.1 L/100 km ... 55.2 mpg (Imp)