TFL in general is quite incompetent. They originally thought the CX50 in camo was the cx60. The car had the front brake caliper on the front of the rotor, this always fwd. With regards to the straight 6, it makes 60 more hp because of premium, another stupid assertion on their part. If you look at after market ecu tunes the difference between 91 and 93 octane is 4% more hp, or 2% per point on octane. The 340 hp tune is for 91 octane since 93 is not available everywhere. So going from 87 to 91 should give you about 8% more power or 22 more hp not 60. Even if the 340 hp tune is on 93 that would put you at around 312. With the 340 hp version putting out only 103 hp per liter ( very low by turbo standards ) Iam surprised it requires premium. I suspect the turbos are the same size and the boost psi is little different. The boost must be real low, What supprises me is the premium s turbo is $7500 more than the regular premium model. The standard equipment is very similar, the s has some options the non s has and visa versa. The difference of not being the adaptive headlight on the s type. So you are paying about $7000 for a different ecu tune which costs Mazda nothing. This is bad marketing move for Mazda they could have really differentiated themselves from the competition by having the 340 hp with a 93 rating and 87 rating like they do in the 2.5 turbo.