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Old 04-24-2013, 07:10 PM   #1
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ScanGauge - MPG reader

Anybody have a scan gauge or something similar to read mpg and such? I have the 98 tj so It doesn't have anything like it.
If you have one Id like to know if you reccomend it and how you install it.
Thanks
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Old 04-24-2013, 07:22 PM   #2
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The best MPG reader is to calculate it manually. Scanners estimate fuel consumption by the gauge reading which is not very accurate in wranglers.

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Old 04-24-2013, 07:44 PM   #3
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I want to know real time what the statistics on my jeep are though and I don't care for math.
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Old 04-24-2013, 07:58 PM   #4
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I do not believe there is anything that will give you real time mpg by estimating the fuel left in the tank. You would have to install a metering system to accurately measure the fuel flowing from the tank to the engine. It's what the auto manufacturers and testing companies use not the fuel gauge reading which is all a scanner can use. Go get some math skills because you will use it the rest of your life.
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Old 04-24-2013, 08:06 PM   #5
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I said I don't care for math not I don't have math skills, I scored a 610 on the math portion of my SAT's and am in calculus now lol. This supposedly gives real time measurements though. Obviously its not going to be 100% accurate but a general Idea would be nice.

Anyone out there with actual experience with these?
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Old 04-24-2013, 08:17 PM   #6
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Dude.... $5 Dollar Calculator.... Miles traveled/Gallons Consumed.
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Old 04-24-2013, 09:01 PM   #7
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Although you may never hit 129mph, the 7.0 mpg is very achievable!!!
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Old 04-24-2013, 09:13 PM   #8
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I got a cheap elm327 bluetooth obd adapter off ebay for 13.95. Put the Torque program off the Google market on an old Droid phone I am not using. So far the darn things reads the mpg pretty close to what I figure when I fill up. It also reads codes and clears them. It has lots of other features that come in very handy. Although the instant MPG feature is pretty discouraging when I am driving 70 mph against the wind. LOL.
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Old 04-24-2013, 09:29 PM   #9
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I have the tq app and the SG. I like the scan gauge better for many things. It gives you instant mpg, daily mpg, trip mpg, tank mpg, and tons of other obdii data. You just plug it in and it works.
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Old 04-24-2013, 09:35 PM   #10
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I have a scan gauge and it will tell you your MPG at that instant and will also read mpg since last reset. It has many different readings as well as ability to read obd codes and reset the computer. It takes information from the ecm. It will give engine temp., voltage, engine rpm, speed,tps and a lot of other functions. I have used it on several different vehicles and it will give you a lot of information. It plugs into the obd port under the dash.
Hope this helps.
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Old 04-24-2013, 09:57 PM   #11
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The only thing that will truely tell you your actual fuel mileage is fuel used versus miles traveled and thats at the mercy of the accuracy of your odometer.
All the aftermarket gadgets are just toys built to amuse you and make someone else a buck.
If you want a way of estimating your instant mileage add a simple vacumn guage tapped into your intake manifold vacumn. When it reads low vacumn your getting poor mileage when it reads high vacumn your getting better fuel mileage.
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Old 04-24-2013, 10:20 PM   #12
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That's the exact way the scan gauge functions. In the actual mileage window it computes from the ecm which reads miles on the odometer or fractions thereof and the throttle position sensor and fuel flow as determined by the ecm. It is the same method vehicles with that factory option use. It changes every second and is reflected on the gauge. It's best use it to monitor your driving habits and see the changes you make reflected in the readings. It can also monitor the trans temp. which is very important if your towing. I don't use it on the jeep but use it on my motorhome and ford truck when towing.
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Old 04-24-2013, 10:26 PM   #13
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The scan gauge will learn. It try's to guess the amount of fuel left. When you fill up it gives a estimate of the amount of fuel used. Each time you fill up you input the correct amount vs. what the gauge thinks you have used. After 5 or 6 fillup's it will be within a few tenths of the actual fuel used. I have used one a lot for over 4 years. It's a pretty neat toy.
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Old 04-24-2013, 10:39 PM   #14
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I have a scangauge definitely worth the money IMO. The fact that it acts as a code scanner is worth the price alone, all the gauges and information are a nice bonus.

As for fuel milage calculation it isn't simply reading the fuel gauge. In fact the fuel sensor in the tank isn't a publicly known PID for our Jeeps. It's instead calculated through a number of other sensors/data and is pretty accurate.
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Old 04-24-2013, 10:53 PM   #15
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If a division problem is too taxing for you, how about a smartphone app?

I use Fuel Log on Android.

I know it's not real time . . . just suggesting an alternative to the math thing.
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Old 04-24-2013, 11:09 PM   #16
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Can it account for bigger tires w/o changing the speedo gear? I have 33's so I was wondering if there was a setting or something that would take that into consideration.
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Old 04-24-2013, 11:25 PM   #17
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Can it account for bigger tires w/o changing the speedo gear? I have 33's so I was wondering if there was a setting or something that would take that into consideration.
Yes.
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Old 04-25-2013, 05:14 AM   #18
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I have the Scangauge also. Like all the above have indicated, it does read instant MPG and can do average as well as monitor a lot of PCM parameters in cluding MPH/tire adjustment. I the Scangauge for MPH when I got the TJ. The PO had not changed the speedo gear with the 33's.

I admit I have not used the MPG average. SIMPLE math will tell you the average
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Old 04-25-2013, 08:53 AM   #19
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Have it, recommend it, plugs into the OBDII port. You'll get bored with the instantaneous MPG (which you tweak with every fill up), but you'll never start a post war about whether the key on, key off sequence will trigger a dash flash OBD code display on your Jeep
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Old 04-25-2013, 09:34 AM   #20
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you can calibrate the speed in the SG to match a gps and it will use that to calculate mpg. I use the speed on the SG because my speedo is off a lot now. The SG uses the # of fuel injected on each squirt to calculate the mpg, not the gas tank level.
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Old 04-25-2013, 09:42 AM   #21
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I also have a Scangauge and love it. I also have a cheapo Bluetooth OBDII reader & free Torque app. I use a Y-adapter so both can run at the same time.
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Old 04-25-2013, 09:50 AM   #22
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I also have a Scangauge and love it. I also have a cheapo Bluetooth OBDII reader & free Torque app. I use a Y-adapter so both can run at the same time.
Which do you prefer?
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Old 04-25-2013, 10:04 AM   #23
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Which do you prefer?
I use the Scangauge the most. My driving style lends itself well to the Scangauge - I also don't want to be distracted by my phone, have no good way to hold it steady, and have no intention of adding more crap to my dash. I only got the Bluetooth because the O2 sensor capability on the Scangauge sucks. The Torque app allows you to record info & email it to yourself as a CSV file, so you can plot & graph to visualize whats going on over time.
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Old 04-25-2013, 11:10 AM   #24
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I use the Scangauge the most. My driving style lends itself well to the Scangauge - I also don't want to be distracted by my phone, have no good way to hold it steady, and have no intention of adding more crap to my dash. I only got the Bluetooth because the O2 sensor capability on the Scangauge sucks. The Torque app allows you to record info & email it to yourself as a CSV file, so you can plot & graph to visualize whats going on over time.
Oh nice. Thanks.
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Old 04-25-2013, 05:22 PM   #25
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Hey thanks guys. The reviews helped a lot! Since everyone that has one likes it I think I'm going to go ahead and purchase one for myself
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Old 05-01-2013, 07:44 PM   #26
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For those with the paid torque app: does it shown voltage?

I'm using the free app and it doesn't show voltage.
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Old 05-01-2013, 09:10 PM   #27
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Late to the party, but one more happy scangauge user.

I have an excel sheet i also track my mileage on and the scangauge is almost dead on. The only differences come from sometimes overfilling the tank.
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Old 05-05-2013, 10:30 PM   #28
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Anyone?
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Old 05-06-2013, 12:44 AM   #29
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Anyone?
I'll check tomorrow for you if no one answers before me.
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Old 05-06-2013, 01:54 AM   #30
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It can read all obd2 stats. Voltage is on the list...

All info here http://torque-bhp.com/wiki

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