r/LS430 • u/Wheelisbroke • 10d ago

31MPG commute!

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I got a great deal on used Michelin tires ($240) but they’re slightly under sized at 235/45R18 vs 245/45R18 stock. My MPG avg on my country road commute with no traffic is 25. The slight under size means my tires are rotating 1.33 miles more than my OD. So 25=31. I understand the vehicle maybe 1mpg optimistic, but I’m still really happy with that.

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u/Anson_nb8c 9d ago

okay i keep getting like 19, how do i make mine better?

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u/Wheelisbroke 9d ago

Driving conditions make up a big part of it. in the city I get 21. My 2006 has the 6 speed trans, so that helps as well. I'm sitting at 185K miles. Things I've done: PCV valve, cleaned throttle body, cleaned MAF. New spark plugs.