A few people including me, have had bad experiences with these. I've had 2 of them leak. When I go to the dealership and ask for the ones made in Thailand, the comment usually is "oh, you want the good ones"...good enough for me.
My 2016 averaged 37 mpg highway on a 3 hour trip to the beach a few years ago, happened on a set of new Nokian tires, never go that kind of mileage before those tires.
There's actually about a 138 pound difference between the 2. I've had a 2014 fwd and now my 2016 awd, gas mileage is pretty much about the same. Difference in tires does make a difference.
I'm reminded of this post years ago by member OVT about the plugs having a function as a sensor also. You might want to keep the recommended change interval.
Spark plug replacement surprise
Mazda CX-5 Service & Repair Manual - Ion Sensor - Control
I found this to be interesting particularly around the 11 minute mark when he discusses going to a thicker grade oil like quite a few of us have done and CAFE standards.
I had that problem a few years back with my '14. It ended up being the wiring harness connector to the camera in the rear hatch. I disconnected it, sprayed with electronic lube and reconnected it. Problem solved. Simple fix you might want to try first.
Air cabin filters are cheaper, engine air filters are still up there. Even the Mazda online parts places are up there. I bought oil filters last year, ran me about $11. Geeezz
Speaking of maintenance, I just picked up an air filter and 1WPE-14-302 oil filter from the dealer- ran me $47!!!
Air filter- $33.38
oil filter - $17.56
15% discount- $7.64
tax- $2.60
Credit Card surcharge- $1.37
Holy gold plated parts Batman !!
Hey! Just hit 100k miles this morning on the way to work. Happy Birthday to me! Still running strong and quiet, no leaks, great gas mileage, and looks good. Only problem is the ghosting touch screen. Looks like a keeper. Now, on to 200,000 miles...
Ridiculously easy, just make sure you use a torque wrench. Callisto isn't on this forum. OEM plugs are highly recommended but the others have been working well for people.
I'll have to look into the Ravenol for my next drain and fill. I've used their 0w-20 engine oil and was impressed. I'm assuming the ATF is blue like OEM?
People forget that, they also don't figure in average labor rate increases which are anywhere from $140 to $175 per hour these days, so a few hours work can cost you up to $350 easily not including parts. Just look at the prices dealers want for brakes these days as compared to only a few years ago.