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Interesting decrease in Wh/mi

Interesting decrease in Wh/mi

For the first 3 1/2 years of ownership my Wh/mi was pretty consist, averaging 296 on my 2014 S, RWD. Now, for the last 1 1/2 years I've averaged 284. My driving pattern hasn't changed. Tires Pirelli for the last 2 years, Michelin prior, but both LRR tires. I've always keep the tire PSI to 45. I don't think the weather is a factor over such a long span in So. Calif. Either Tesla has had some software updates, making my car more efficient, or maybe I'm driving less aggressively after 5 years of ownership. Regardless, it's interesting and very consistent.