5 mpg gain!!
#1
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Join Date: Mar 2012
Location: York, PA
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Year: 1996
Model: Cherokee
Engine: 4.0 HO
5 mpg gain!!
I live in york pennsylvania and everyone round here will understand the change in temp lately well since it got cold I've noticed a huge drop in my fuel mileage. Out on the trails in the summer my jeep would run too hot for comfort so i put a 180 degree thermostat in which kept it at a mangable temp. But it doesnt even get to operating temperatures now. (205-215) I noticed on our shops scan tool that the o2 sensor was showing richer than it should have been and my coolant temps around 160-170. So i put a peice of cardboard in front of my grill to prevent the radiator from working too efficiently. My coolant temp is perfectly in range and I went from 13ish to 18 mpg backroad and city driving on 31's with 3.07 gears and 242 thousand miles on my 4.0 5spd cherokee with a bit of extra weight. Just a thought for everyone else who noticed a signifigant drop in mileage. Sorry if my spelling made that hard to decipher haha
#2
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Year: 1996
Model: Cherokee
Engine: 4.0L HO
lol I get 12-14mpg on 31s. If I keep my foot out of it when its cold I actually get up to 17 but with a cowl snorkel and 20 degree outside air, romping on it is so much fun
#6
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Year: 1996
Model: Cherokee
Engine: 4.0 HO
The 180 thermostat keeps the engin running cooler but it wasn't even getting to operating temps now that its cold. The engine runs richer until its warmed up so I was running rich all day long. I calculated my mpg by filling up running till the light came on then refilled and divided the miles traveld by the amount of fuel the second fill up took
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#8
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Putting the cardboard over the grille raised the mileage allowing the vehicle to get to operating temp as it was not doing so with the 180* t-stat in the winter weather.
Last edited by prerunner1982; 11-30-2012 at 04:40 PM.
#10
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Year: 1987
Model: Wagoneer
Engine: Renix 4.0
Water boils at 212°. So a 50/50 mix at 16psi should be round 240.
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