The front fog lights are damn near useless, as with most fog lights in modern cars. The housings used in our CX-5 is the SAME housing used in many Mazda's since 2003. It is about as useful as a $1 flashlight in projecting a fog suitable wide beam with an adequate horizontal cut off. There is an apparent hot spot with our fog light housing within 6-7ft of the bumper, and nothing more to the sides. This is exactly what you don't want with a fog light. Fortunately, the housings are so poorly designed especially with the glare cap, that it won't distract any drivers when it is lit using the low beams. Again, as with most modern fog lights. They are purely there for aesthetics.
I have even gone as far as experimenting with removal of the glare caps in our Mazda fog light housings. Recently I have converted 3000 kevlin (selective yellow for poor conditions) H9 bulbs to use in our H11 housings. Reason being that H9 produce ~500 more lumen than the H11 without harming the reflector housings, harness, and relays. I have found that the combination of a selective yellow 65W H9 in factory H11 housings (WITH THE GLARE CAP) aimed slightly higher to produce the best results. Though that doesn't say much, as it still does not produce much adequate lighting to use as fog lights.
Here is a good read up:
http://www.danielsternlighting.com/tech/lights/fog_lamps/fog_lamps.html
http://deepblue.lib.umich.edu/bitstream/handle/2027.42/49453/UMTRI-2001-40.pdf?sequence=1
As someone that condones absolute knowledge and proper usage of vehicle lighting; I can't say that I have anything against the usage of having our foglights on with the low beams during nighttime. Though that is only without the glare cap removed and without an HID conversion.
What I am more against are the tards re-aiming their headlights improperly. I am HIGHLY also against tards using their highbeams and rear fogs when they are not needed. I covered the misinformation on projector cut off and poor headlight aiming (as suggested by a few ignorant members here).
http://www.mazdas247.com/forum/showthread.php?123823540-headlight-low-beams-with-abrupt-shadow/page2
Now with all that said. I am still thinking about converting my rear bumper's reflector housings to fog lights. I have been too busy to remove them, crack them open, then wire up a PCB board with LED's. The hardest part for me is finding a switch or a button that I can mount and look ABSOLUTELY factory. No, that does not mean tapping a hole into one of the empty spots in my dash and slapping on a basic switch. I want none of that. I have thought about buying the European CX-5's light stalk which has a factory switch for the rear fogs.
I have made my own rear fog for my RX-8 two years ago. Bought an OEM rear fog dash button and wired it up that way. I wish it was that easy for the CX-5...
<a href="http://www.flickr.com/photos/saynotopistons/7123919805/" title="beltback8 by SayNoToPistons, on Flickr"><img src="http://farm9.staticflickr.com/8019/7123919805_870c9f207f_c.jpg" width="800" height="534" alt="beltback8"></a>