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Right, it might be worth buying the fluid from Mazda and supplying the independant mechanic if necessary.

It seems to depend on the vehicle. I usually look for the low teens for idle, mid-twenties to thirties cruising. Accelerating it will be in the 30's-50's. There are times when I have the pedal down a bit, maybe halfway, and the TPS jumps from the 50's to 91 on it's own, possibly for efficiency...

Go for it!

TPS is throttle position sensor.

I don't think there are many items that normally need attention until the mileage is higher, 75kmi for the plugs, for example. The coolant is good for at least 10 years. How are the tires?

I think there is a body control unit. maybe there is a problem there. . Even if you leave a door ajar, the lights will eventually turn off (about 20 mintues). If you lock the car do the lights 'fade' in the normal way?

The same situation I have... I change it when it's convenient. I use good oil and I don't believe it suddenly goes bad in exactly a year.

It won't last long with coolant in the oil, it's really bad for the bearings.

A little squirt of Windex, which has a lot of ammonia, should neutralize the acid if there is any on the cable ends.

Sometimes that smell is from oil that is on the engine and gets to the exhaust manifold. It could have been spilled during an oil change. Sport mode on the highway probably gets the engine hotter than your usual drive. Sometimes the belts on an engine might smell, too.

I wonder why there aren't any 'codes'?

I had a car with bad valve stems seals. It would smoke noticeably under a couple of condtions> 1.If the engine was thoroughly warmed up, shut down, then restarted after sitting a bit 2. After coasting down a long hill then when you touch the gas again. The oil builds up in the cylinder head in...

Then I guess it is because the Turbo is designed to run better on 93 octane. I think this has been documented before.

How often you change the oil is about how much pollution (combustion byproducts, wear from metal parts in the engine, dirt passing through the air intake) accumulates in the oil, plus the oil gets worn out gradually from the heat and friction, etc., causing the oil to become 'thicker' but less...

Was the 93 octane ethanol-free? I always get better mpg with ethanol-free, no matter 91 or 93 octane.

I remember on a recent trip stopping several times and for some reason each time it took 11.2 gal to fill. Of course I don't want to completely run it out of gas but the manual says 15 gals I believe.

Not a lot of miles but I think some people have had some problems with the pulley. It might leak hydraulic fluid and you can see it. It's good to use a flashlight. The water pump should last a long time so there's no interval, but a 2015 could have a lot more miles, that's why I asked.

They don't need much, so unless the dealer is fabricating problems or extra expensive extra services she shouldn't need to see them very often.

The range computer changes its estimate of remaining miles according to recent driving habits and mpg. I've noticed that at times the estimated range has gone up, because I went from urban driving to cruising on the highway driving with better mpgs, causing the computer to re-estimate the range...

So, it's about 10 years old, how many miles? Have you used a stethoscope or something to listen to the knock? Does the knock go away, or is it worse if you stop and idle after a long drive? Have you ever replaced items like the water pump, or idler pulley on the serpentine belt?