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I question the BRZ vs WRX I4 that has been put into this article. It isn't in anyway a fair comparison to show that the smaller 2.0 is more "efficient" than the larger bored 2.5. There are so many factors in fuel efficiency and it isn't just engine vs engine. Weight, tires and gear ratio all play a role into this equation and all are being tossed into the wind with this comparison.
For starters, the WRX weights a hefty 3208 pounds, while the BRZ weighs in at 2776 pounds. That equates to a whopping 432 pounds more that the WRX is lugging around that the smaller 2.0 doesn't have to deal with. This alone will help squeeze out a bit more MPG.
To make matters even more interesting, you have the BRZ rolling around on thin, fuel efficient tires. Let's see how much the MPG will drop if they swap to the WRX stock tires or even proper summer only tires for maximum grip.
This isn't a fair comparison in any way and should of been left off the list entirely. Why in the world would anyone compare an AWD sedan to a RWD sporty/sports car for MPG? Just because both are Subaru, doesn't mean it is possible to even compare the two.