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I am new to the forum lots of good info.

I have a 2013 Civic LX I bought new it is just turning 400,000 KM (248,548 M) 90% highway
The plugs were changed at 100,000 KM (62,137 M)
I put a wheel bearing and used axle on the passenger side a couple years ago..
I do the oil every 8 .000
Transition fluid, coolant, tires, brakes,

A couple years ago I had a throttle body sensor error that my buddy cleared and still OK.

I`m getting 6.9L/100KM or 34 miles to the gallon.

I don’t know if I should change the plugs or do anything else or should I leave it alone how long can this car go?

 
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Maybe pull a plug out and see how it looks?

 
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Plugs will go 100k miles so if they were last replaced at 62k I would probably just change them.

If properly maintained I don't think they have a "lifespan".

 
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Hey guys,
Thanks for your input much appreciated.
I'm hoping for another 100,000 Km so I better change them.
My next car will be a Honda Civic!