Pepe, I doubt there is actually any power difference between your version and the USA version. Honda certainly wouldn't detune it for Mexico. Someone already mentioned that it could be because it is measured slightly differently. Another possibility is that insurance concerns, or licensing concerns might make it cheaper to appear to be slightly less powerful.
If Honda did any actual detuning it would have been with such a light hand that it wouldn't be real world noticeable. With the electronic controls, if they actually wanted 3 less HP it could be done in such a way that the power would just be shaved from waaay up the power curve where it would be unnoticeable.
CR did get fairly low mpg (26 I think) in their very rugged city loop, so numbers in the high 20's wouldn't be unusual-especially in mountainous areas.Your elevation must be~5000 ft, so your actual peak power will be down maybe 10%.Still, if you have to live in mts. you will do better with a Hybrid. If you are coming down a hill and know you have to stop at the foot of it, you can start braking early and steal of bit of the lost energy.Without a hybrid you lose all the energy as heat.A hybrid is the right car for hilly cities.
Luck,Charlie