The Mazda3 gasoline SkyActiv is pretty efficient already. My 2015 almost-all-highway-driven 2.0L automatic has achieved an average of 43.3 mpg over the 22,000 miles I've owned it so far, as recorded in my Fuelly account. It's been 100% reliable, and fun to drive too. No hardcore hypermiling involved, just smooth and sensible highway miles.
I hope Mazda can boost that by 30%.
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