Have to start by asking how much $$
My Golf's FIRST tank was 58 mpg (yes I was trying hard, but I didn't have a Scangauge)
If you want 50 in the Mazda I say you need FE instrumentation, I'd bet you could get around 40 by tweaking driving habits.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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