I never thought to ask the size of the gas tank, which was 11.2, but with Mazda's formula it shows you empty before 10 gallons, so I was filling the car up 2 times per week.
That's a feature of many cars these days, not just a Mazda thing (and has been a feature in some cars for over a decade)- with cars that show you a "Range" (miles to empty), they give you some wiggle room so that you don't run so low that the fuel pump is damaged. Some say the wiggle room is so that dumb people who let it run to ~0 still have plenty of time to refill before becoming stranded. Either way, it's a feature.
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Can I have a link to this thread?
The bulk of the conversation is on mazda3revolution.com, of which you need an account to view more than 2 or 3 pages of threads. https://mazda3revolution.com/forums...s/228689-carplay-diagram-installation-25.html
At this point, I believe only the beta firmware for v70.00.000 (the AA/CarPlay firmware for MZD/MazdaConnect) is out, and it's only the EU version. Some people have been ordering the parts from taobao.cn (CHINA!) but I don't think anyone has been able to enable CarPlay. When ordering from China, you risk getting a green-sticker retrofit USB/Aux/SD module which is apparently a scam. Orange sticker is what you want. Anyway we can't do anything in the US until someone leaks the v70.00.000 US firmware.