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Sorry for the repost earlier, but in my vw Tdi I've noticed a 2-3 mpg loss, but I'm only on my second tank. Takes awhile to fill up when you can go over 700 miles on a tank of fuel. My X5 35d has gone from all highway miles to all city miles at the same time I made the switch to HPR, so hard to tell.
Last tank of HPR in th X5 35d was 17.5 MPG all city.
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