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MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

posted by  urdrwho on  Wed Jan 25 11:43 CST 2017
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last visit: Tue Aug 19 08:10 CST 2014
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My previous daily driver was the 2002 S60 but in Sept 2017 my wife got another car and now I have her 2007 V50. Before the S60 I was driving a (very good condition) 1990 Jaguar XJ40 (also known as an XJ6).

The Volvo had a flat head 4.0 engine.

All the cars mentioned above are driven in my same daily routine which is mostly stop / go around town.

1990 Jaguar MPG was mid 15 (199,000 miles on odometer) non turbo
2002 S60 is sitting at 17.4 (223,000 miles on odometer) turbo
2007 V50 is sitting at 15.4 (103,740 on odometer) turbo

The V50 seems to be running well but last week it dawned on me that the MPG seems low. I use premium and full syn oil.

Last fall I had the PCV system replaced under extended warranty. When I retrieved the car from the dealer they had only replaced the box, nothing else. Volvo USA warranty said that that under the extended warranty the hose was to br replace and the intake O rings, etc.

I called and the dealer said bring the car in and they will take care of it. Retrieved the car and they gave me a $50 gift card to be used at the dealer. Checking the car they forget to tighten the one hose clamp on the big hose that goes over the top of the engine.

So here I am thinking about this mileage thing and I am wondering if they did the O rings correctly, did they pinch one, is there something else at hand, etc?

No CEL.

I can't believe that I am not getting better mileage than the big, 4,000 pound, 1990 Jaguar that was a 4 speed auto without OD.

Maybe this mileage is as good as it gets?








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    MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

    posted by  riverbend on  Wed Jan 25 19:42 CST 2017
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    last visit: Wed Oct 22 15:29 CST 2014
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    The Volvo had a flat head 4.0 engine ?








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      MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

      posted by  urdrwho on  Sat Jan 28 15:29 CST 2017
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      last visit: Tue Aug 19 08:10 CST 2014
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      No the Jag had a flat head six.








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        MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

        posted by  riverbend on  Sat Jan 28 16:03 CST 2017
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        last visit: Wed Oct 22 15:29 CST 2014
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        ?! Jaguar introduced the DOHC XK6 engine in 1949. You must mean something other than flathead, i.e. sidevalve. Even Ford got away from flatheads in the early '50s.

        Greg







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          MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

          posted by  urdrwho on  Mon Jan 30 09:15 CST 2017
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          last visit: Tue Aug 19 08:10 CST 2014
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          Yep -- it had dual cams that resided on each side of that big heavy head.

          Maybe I am confusing you and should say inline six. Ha --- all healthy heads are flat. I think that on the jag forums we some of us just adopted calling them flat head six --- example from a jag forum "We used to split the manifolds in flat head six "

          So I really should be saying inline six.

          I also owned a SIII one time. Electrical nightmare.....Lucas prince of darkness.

          https://en.wikipedia.org/wiki/Jaguar_XK6_engine







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    MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

    posted by  KlausC on  Wed Jan 25 13:53 CST 2017
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    last visit: Fri Oct 24 10:15 CST 2014
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    All 3 cars have poor mileage, the XJ6 should have gotten 18mpg.

    I assume you are looking at the computer display for avg mpg. Have you reset it lately? How long do you let your car warm up in the winter? How long is your commute/average drive?

    Unless you like to exceed 4500 rpm a lot, you shouldn't need premium gasoline.

    Check the tire pressure, then check the spark plugs. The gap is .028 for single prong plugs, copper core. No need for iridium or platinum which don't last as long.

    Does your car heat up rapidly, like in one mile, after cold start? If not you may have a wrong temperature thermostat.

    Sounds like you have a shoddy dealership, or lazy mechanic. A poor functioning PCV will blow seals, but not impede mpg.
    --
    Keeping it running is better than buying new








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      MPG seems to be low 2007 V50 AWD auto - 15.4 MPG V50

      posted by  urdrwho on  Sat Jan 28 15:44 CST 2017
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      last visit: Tue Aug 19 08:10 CST 2014
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      I don't think me or my wife have had this car to 4500. Hm...maybe when we have to give it the pedal getting on the freeway at times, I just don't think so.

      Yes the computer display is what I am looking at and I recently reset it.

      I don't let my car warm up in winter. I just go very light on it for the first half mile or so.

      No commute...I work at home. When I do go out it is to the gym - 4 miles one way, cup of coffee - 2 miles one way, etc. Stop and go at 25 mph to 40 mph. Going to the gym there are are 5 stop lights and two stop signs. It is a high probability that I get the red light. The last time I re-set the computer my average MPH was 21 and that was probably over 100 miles.

      To have the temp needle hit half way, the car does take a bit longer than I like and maybe easily be a mile or more.

      I check the tire pressure every month and I am due to check them.

      I haven't checked the plugs yet because it has been too darn cold out.






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