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4bangerJP.com > General Forums > The Work Bench > Topic: Gas Mileage Thread
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Jeffy
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« Reply #255 on: August 22, 2011, 04:31:02 PM »
Quote from: FourbangerYJ on August 22, 2011, 03:54:15 PM
I knew if I slowed down I would get better mileage. While convoying with another Jeep we averaged between 60-65 (2700-2800 RPM) miles per hour. I got 17.3 MPG loaded to the gills and climbing the Grapevine from L.A. towards Fresno. I had no idea that 500 RPM would make such a huge change. Last time I did this trip a few weeks ago I was just as loaded and averaged 11.5 MPG while doing 70+ and 3200 RPM.
Wind resistance/aerodynamics comes into play at speeds above 35MPH and increase exponentially.  Dropping down from 70mph to 60mph makes a huge difference.  Drop down to 50-55mph and you'll see more gain.
« Last Edit: August 22, 2011, 04:51:18 PM by Jeffy » Logged
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road2damascus
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« Reply #256 on: August 23, 2011, 07:13:26 AM »
Quote from: Jeffy on August 22, 2011, 04:31:02 PM
Wind resistance/aerodynamics comes into play at speeds above 35MPH and increase exponentially.  Dropping down from 70mph to 60mph makes a huge difference.  Drop down to 50-55mph and you'll see more gain.

I have the option of driving to work on the expressway  (at)  55mph (around 2500rpm in fifth) or taking side streets  (at)  up to 45 mph (never over 2000rpm). I have tried both ways with full tanks of gas. There is a huge difference in MPG. Never getting past 2000 rpm for long distances sucks a lot less fuel. The other day I was going 70 mph  (at)  3500rpm and I could look down every five minutes and see the gas gauge go lower and lower.
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chardrc
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« Reply #257 on: August 23, 2011, 11:36:30 AM »
Quote from: road2damascus on August 23, 2011, 07:13:26 AM
The other day I was going 70 mph  (at)  3500rpm and I could look down every five minutes and see the gas gauge go lower and lower.

I have watched my gas gauge go down almost a quarter tank on my drive home when I go over 70mph.  yikes... speed definitely makes a difference. couldn't imagine going any real distance with all under 2000 rpm. my jeep doesn't come to life until 2000k (aka if you want to have a chance to maintain speed on a hill in 4th) and gets nice around 2500rpm.
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« Reply #258 on: August 23, 2011, 12:31:04 PM »
Quote from: chardrc on August 23, 2011, 11:36:30 AM
couldn't imagine going any real distance with all under 2000 rpm. my jeep doesn't come to life until 2000k (aka if you want to have a chance to maintain speed on a hill in 4th) and gets nice around 2500rpm.
I could barely hold my speed at 2k and definitely could not accelerate from those rmps. Now that I have the 4.0L throttle body it at least doesn't feel boggy. I need a good flat surface to drive around 2k and certainly no less than that.
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« Reply #259 on: August 23, 2011, 06:42:22 PM »
Chicago-land is flat. I shift after 2000 rpm. On hills I down shift. With stock gears, 30" tires and modifications it does fine. Last MPG uncorrected was 17.7 uncorrected for the tires.
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« Reply #260 on: August 23, 2011, 08:04:25 PM »
Just go back from a trip from Delaware to Tennessee.95 Jeep 2.5L got 21.6 mpg down and back. stock 225/15 tires. stock 410 gears.  I was getting between 16 and 18 before installing electric fan and 4.0tb.
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« Reply #261 on: August 24, 2011, 02:43:41 PM »
Quote from: reddogg on August 23, 2011, 08:04:25 PM
Just go back from a trip from Delaware to Tennessee.95 Jeep 2.5L got 21.6 mpg down and back. stock 225/15 tires. stock 410 gears.  I was getting between 16 and 18 before installing electric fan and 4.0tb.

nice!! shows improvement with the mild upgrades
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