well it depends.
the 97 and 00 max's i definitly know a thing or two about.
the es300, youre talking about the older model right? before the bug eyed look on the newer ones...
well either way, i could probably clean out your intake manifolds, throttle body, change out the airbox filter, change to synthetic oil, check the tire pressures, pour some gumout full injection cleaner, and you'll probably be seeing the gas mileage shoot back up like it was brand new.
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