I did see an improvement on the economy, an extra 20km per tank.
But, I put the original Plug back in a this brisk Plug, is causing a stuttering, backfiring, from cold start.
I got as far as the stop sign, 100m,it cut out and refused to start.
I pushed it back home and took out that Plug, and saw it was totally black, while the original Plug was the correct light brown.
Pity
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