20K replacement cycle is 1-2 years for more drivers. There is no way I'd want to change spark plugs that often. Good luck on your tests and please report back. 
Spark plugs - non O.E.?
Has anyone experimented with non-OE (i.e. non-Iridium) plugs in our ICEs?
It has been a long standing argument among the VW community (cars in the 2000s and newer generations) that you get (significantly?) better fuel economy with Copper plugs over Iridium at the cost of the plugs wearing out 2-3x faster.
At present I drive a lot of ICE miles, so I'd be willing to Guinea pig myself if I can determine what plugs are "compatible"
It has been a long standing argument among the VW community (cars in the 2000s and newer generations) that you get (significantly?) better fuel economy with Copper plugs over Iridium at the cost of the plugs wearing out 2-3x faster.
At present I drive a lot of ICE miles, so I'd be willing to Guinea pig myself if I can determine what plugs are "compatible"
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