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Unread 10-08-2010, 02:27 AM   #1
Lafaso870
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Thoughts On Gas Mileage

Using the EVIC history and the equivalent history on the Pathfinder + plus just eyeballing the tachs, I have noticed that:

2007 Patriot Limited 2.4L w/FDII at 100kmh tachs at 3000 rpm
2010 Pathfinder LE 4.0L 6 speed auto at 100kmh tachs at 2000 rpm

Patriot's EVIC reports average gas mileage of 11.5 litres per 100km of travel
Pathfinder's equiv reports gas mileage of 12.2 litres per 100km of travel

Travel type for each vehicle is both city and highway combined.

With *virtually* double displacement of the Pathfinder mill, the additional gasoline burden with the Pathfinder is less than 1 litre per 100km.

The 6 cyl mill obvious works less hard but what does this say about the gas mileage for an FDII? Either the mileage for Patriot is abysmal or the Pathfinder's mileage is incredible.

Another detail to mention is the Pathfinder requires premium fuel (91) or about 13 cents per litre over regular unleaded (87).

Thoughts?

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Unread 10-08-2010, 05:51 AM   #2
Gramps
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Patriot about 20.5 mpg. It doesn't sound too bad but I wonder what the other FD II folks are getting? Do you use/need the off-road capabilities at all? Maybe the FD I would have been a better choice. I'm getting about 24/25 mpg any more (9.4 - 9.8 litres/100km) and 62 mph (about 100 kph)is about 2100 rpm.

Pathfinder about 19.3 mpg. Is this a 4X4? More towing capacity and room and maybe a higher initial cost and higher cost per mile because of the premium fuel.

Two really different vehicles with different capabilities. I'm just not sure if it's a fair comparison for gas mileage alone.
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Unread 10-08-2010, 10:24 AM   #3
AJeepZJ
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Very curious to know if that mileage is observed in the 4x4 or 4x2 for the Pathfinder...
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Unread 10-08-2010, 11:43 AM   #4
miketmx
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Our Cherokee usually takes more than 12 L per 100 km while the EVIC often shows 7.8 L per 100 km for highway driving with our FD1 Patriot with the 5 speed MT. I figure 30 mpg for the Patriot compared to 20 mpg for the Cherokee.
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Unread 10-08-2010, 10:08 PM   #5
willard
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My money is on the transmissions, and maybe wheel size.
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Unread 10-12-2010, 01:22 AM   #6
Tony1911
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It seems that the FDII's lower gearing really starts to hurt its fuel economy at high speeds. When you've reached the highest gearing available, the only way to go faster is to spin the engine faster...

Quote:
Originally Posted by Lafaso870 View Post
With *virtually* double displacement of the Pathfinder mill, the additional gasoline burden with the Pathfinder is less than 1 litre per 100km.
You can't look at fuel economy strictly as a function of engine displacement. The laws of physics state that in order to move an X kg vehicle, Y joules of energy must be used. A larger displacement engine that is able to put out the needed amount of energy with lower RPM may indeed be more economical than a smaller engine that needs to be revved way up. On the other hand, it eats up more fuel when just idling, so during conditions where both engines can keep a low RPM, the smaller one wins the fuel economy contest. And of course, when you compare two totally different vehicles, there are a whole host of variables. Driving conditions, tires, driving style variances, etc. etc. can all enter into it.

All that said, it does appear that especially with the FDII, the best fuel economy is achieved with slower speeds. I've noticed the same with my FDI - the lowest fuel consumption I get is consistently during conditions when I must keep my driving speed around 80km/h. And with the overall lower gearing of the FDII, there should be an even more pronounced difference between the fuel economy during lower speed and high speed driving.
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Unread 10-12-2010, 12:57 PM   #7
unibus
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My 2007 compass 2wd (CVT) has consumed 2022 gallons of gas since purchase.
It's mileage for that fuel has been 23.13 mpg.
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Unread 10-13-2010, 12:03 PM   #8
willard
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I'm just saying that if you change your wheel size and/or composision, you're going to change your MPG
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Unread 11-08-2010, 04:56 AM   #9
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I get 27 MPG consistently on my 09 Compass Ralleye 5 spd 4x4. It goes down to 25 MPG in the winter time.
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Unread 11-08-2010, 10:25 AM   #10
miketmx
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I was amazed at the mileage numbers our U.K. owners seem to get. I recently found out that they use Imperial Gallons (about 20% larger than U.S. Gallons) in the U.K.. Years ago Imperial Gallons were used in Canada and I believe Canadian Dealers have no problem quoting gas mileage numbers with the non-existant size gallon because it sounds a lot better than the numbers with U.S. gallons. I would get about 36 miles to the Imperial Gallon if there was such a thing.
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Unread 11-08-2010, 01:14 PM   #11
bseblfrk09
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In my 2008 compass FWD I average about 30 mpg's. I travel long distances though. I bet I will get better on
Y road trips when I get some taller tires on it.
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