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just took a 140 mile RT on saturday in the 300E. ended up getting about 26mpg, cruising at 70. i figure if i do a tune up (new plugs, wires and dist) it might help account for another 1-2mpg.
tire pressure also can play a factor, the tires were around 27psi to keep the ride plush, but bumped them up to 32 and it definitely rolls further/longer.
i also put in a bottle of techron w/ the last tank, so we'll see if anythign improves otherwise.
city driving yields 15-18mpg.
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