I would like to find out what the main differences are between these to engines. I already know the 2.5 will make more hp and lbft but the Mazda website is listing the 2.5 with VVT whereas the 2.0 is not listed with VVT. Is the 2.5 a better motor than the 2.0 and how significant of a difference will I see in mpg? Some reviews of the 2.5 from owners of the 2014 6 are reporting 40mpg.