XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

What MPG's are you getting

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Old 08-06-2008, 08:47 PM
Brian Felts's Avatar
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Default What MPG's are you getting

Hey all I didn't get any replys to my earlier post........What kind of MPG's are you getting with a xjs. I have been looking at an 84.....also how do I tell if its a HE or not?

What are the RPM's at 60 or 65 with the 3 speed auto?

Thanks
Brian Felts
 
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Old 09-10-2008, 12:01 AM
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Default RE: What MPG's are you getting

I had 15 MPG highway. I remember replacing thermostat, it was open, but not sure if I checked MPG before or after replacement.
 
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Old 09-10-2008, 07:38 AM
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Default RE: What MPG's are you getting

I don't know about mpg's yet but we run about 2300-2500 at 60 or so...it's hard to keep it that slow now that it's running right..90 XJ-S 5.3.L
 
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Old 09-24-2008, 11:47 AM
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Default RE: What MPG's are you getting

My 1988 XJ-SC 5.3L will get 17MPG on the hwy and around 13MPG in town if I keep my foot out of it. The hwy mileage is with the car running around 70-75. Cruising at 60-65 I've actually gotten 17.5. At 65MPH the engine is turning about 2400RPM as I recall. Even at 80MPH it gets 16MPG which isn't too bad for a 4400lb car feeding a V12. The 5.3L V12 HE was introduced in the 1981 model year so the 1984 XJ-S would have the HE (high efficiency) engine.
 
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Old 11-10-2008, 10:12 AM
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Default RE: What MPG's are you getting

My 1988 XJS V12 gets 11 to 15 highway. Depends on how FAST you drive.
at 80 MPH it is only 11 mpg.
At 55 it is 15 mpg.

That is NOT a computer estimate. That is tracking miles devided by gallons at pump.

 
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