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Unread 03-04-2012, 07:57 AM   #1
Camaro16
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1998 ZJ 
 
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MPG on cruise control?

Does anyone else get significantly better mileage using cruise control? Normally, if I take it as easily as possible, I'll get around 340 miles on a full tank.
Now I know the DTE computer isn't going to be totally accurate, but I filled the tank yesterday and then did 150 miles, at about 60mph, all on cruise. And my DTE readout is still 276 miles! The fuel gauge seems to back that up, as well.
Anyone else notice big differences between grannying it without cruise, and doing the same mileage at the same speed with cruise turned on? It's a fairly big deal - at the minute (I'm in the UK) it costs me $200 to fill up from empty!

Oh - 1998 4.0 engined Orvis with the tow package, presume the gearing affects things.

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Unread 03-04-2012, 08:13 AM   #2
AcidAnton
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Of course cruise control is the best way to keep and maintain a consistent momentum and you are not always hitting the gas peddle when you loose speed and try to maintain the speed limit..

I always use cruise, I found I save way more gas
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Unread 03-04-2012, 08:47 AM   #3
gactech
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Yup. The cc makes itty bitty adjustments to the throttle to maintain speed. Your for doesn't
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Unread 03-04-2012, 08:50 AM   #4
burtha95xj
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In my xj i get worst highway mpg, period
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Unread 03-04-2012, 09:02 AM   #5
Foundrydude
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Some other OBDII vehicles of this era actually use more efficient fuel and spark curves when the cruise is engaged. Not sure aboutr ZJ.
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Unread 03-04-2012, 09:42 AM   #6
Camaro16
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Originally Posted by gactech View Post
Yup. The cc makes itty bitty adjustments to the throttle to maintain speed. Your for doesn't
My foot tries to!
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Unread 03-04-2012, 10:07 AM   #7
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Yup, same thing with every other car I've owned that had CC. Although with my ZJ when I'm hitting larger hills I use the gas pedal, so I can gain some speed before I hit the hill. Otherwise the CC always kicks the tranny down a gear or two, since the 4.0 doesn't have the guts to make the grade in OD. If I get a "running start" at the hill I can make it up in OD if it's not too long.
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Unread 03-04-2012, 12:51 PM   #8
cdaniels85
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Quote:
Originally Posted by Mike97ZJ
Yup, same thing with every other car I've owned that had CC. Although with my ZJ when I'm hitting larger hills I use the gas pedal, so I can gain some speed before I hit the hill. Otherwise the CC always kicks the tranny down a gear or two, since the 4.0 doesn't have the guts to make the grade in OD. If I get a "running start" at the hill I can make it up in OD if it's not too long.
x2 on that. I've gotten it down to a science.
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Unread 02-05-2013, 04:30 PM   #9
mickeyd411
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Originally Posted by Mike97ZJ View Post
Yup, same thing with every other car I've owned that had CC. Although with my ZJ when I'm hitting larger hills I use the gas pedal, so I can gain some speed before I hit the hill. Otherwise the CC always kicks the tranny down a gear or two, since the 4.0 doesn't have the guts to make the grade in OD. If I get a "running start" at the hill I can make it up in OD if it's not too long.
I am seriously considering an attempt to limit how much throttle the cruise can add. This thing opens up going up a hill and that can't be good for mpg!
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Unread 02-05-2013, 05:25 PM   #10
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In the UK too. Converted to LPG. I work it out by pence per mile cost between fills to max. Yesterday running up the M1 filled up at London gateway services then again at junction 24 having gone the whole way on cruise at a steady 70. Cost me slightly less than 20p per mile which is awesome. Driving it the whole way without cruise I reckon the best I could get is probably about 23. So that would make a 15% improvement on a long steady run.
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