XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

X350 Highway MPG how are we doing?

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  #21  
Old 09-16-2014, 07:21 AM
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Having had the car a long time, it is pretty consistent getting 22-23 mpg around town and 30 mpg on the road. If I take a long winter trip (no AC) on cruise control at 75, it will get around 33-34 mpg.
 
  #22  
Old 09-16-2014, 10:44 AM
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Originally Posted by Cambo351
OK I have to confess. That's 36.6mpg in Imperial Gallons. It works out as 30.5mpg in US gallons, 7.7 litres per 100km.

That was on a 680km round trip in Switzerland, cool weather, and I was doing my best to drive economically, I drove the whole way looking at the instant fuel readout & tried to keep it on 7L/100km as much as possible.

I have never driven a fast car so slowly, I got passed by everyone on the highway; cars, trucks, buses, you name it they overtook me.

Have not come close to that mileage since. Best on the last long trip was 8.8L/100km which is 32.1mpg (UK) and 26.7mpg (US)
I suspected it might not be US gallons, which is why a bunch of us in the US were really envious of you!! If I drive my car on level ground at 60mph, it will hit 30mpg+ on the instant display, and noticeably better if I slow to 52mph (right when the torque converter lock up happens). Of course, with normal freeway driving speeds, it drops to 24-25mph.
 
  #23  
Old 09-16-2014, 02:46 PM
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The best I have got has been 35mpg (UK) this was on a trip to Santa Pod. Not driving too efficiently 75 mph and plenty of full throttle on cruise though and slow roadworks.

No photo, but the week before:
 
  #24  
Old 09-18-2014, 09:56 AM
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I can't check mine because the button at the end of my Turn signal stalk is dead


I wish this wasn't true though because my MPG seems pretty low, even after a full tune up.
 
  #25  
Old 09-18-2014, 02:17 PM
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Originally Posted by Revonok
I can't check mine because the button at the end of my Turn signal stalk is dead


I wish this wasn't true though because my MPG seems pretty low, even after a full tune up.
The stalks are VERY inexpensive & extremely easy to replace. I replaced mine, only because the 'chrome' had wore off the button, leaving it cream looking, but it did work; but it's simple to replace though...
 
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