The 2.3L 4-cylinder engine found in the Mazda6 is completely adequate for most people, but when combined with the body of the Mazda6, causes some noticeable deficiencies.
1) The body weighs too much overall.
This leads to mediocre acceleration.
I will say, however, the speed and power available on long uphill grades is above average.
2) The body is low-profile.
This means you can't put standard chains on the front tires.
Only cables or low-profile chains (which are extremely expensive).
3) If you drive much past 90 mph, the downforce winds and centrifugal force on the tires cause the tires to rub against the wheel wells.
The engine is capable of more than the body can take
I love the orange interior lights at night.
Feels like I'm driving the Batmobile.
I've also gotten a few complements on the body style of my Mazda.
1) Raise the vehicle enough to allow chains and eliminate the problem of tires rubbing against the wheel wells.
2) Reduce the overall weight or make the engine bigger to improve acceleration.