My car does something similar: idle around 820 rpm when coasting, which drops to 740 rpm at standstill. I forgot what the consumption is then, but I'd also love to lower idle speed. I'm willing to bet that it is controlled by algorithms in the ECU, so changing it may not be easy, if at all possible.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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