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Unread 02-20-2014, 03:25 PM   #30361
Gearhead31
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1995 ZJ 
 
Join Date: Feb 2012
Location: St Pete, Florida
Posts: 1,939
Quote:
Originally Posted by ejschultz View Post
I'm not quite sure anyone other than us knows how to actually calculate mpg effectively. I'm always right around what you're posting for overhead vs hand calculation...

For those of you who don't know, the most effective way is to fill up, reset the trip, drive your regular routes, fill up again, take the mileage driven in that time and divide it by the amount of gas the second fill up took. Neither fill up should be topped off, preferably use the same pump at the same station to ensure accuracy between pump error, and ensure you have the correct speedometer gear for your tire size. If you stray from this, you're not going to get accurate calculations.
Only thing extra I'd suggest is doing that same process over several fill ups. The more readings you do, the more accurage an average you will get. Bigger sample = more reliable data.

Maybe I lucked out having 235 vs 225 tires giving the offset for good readings? The avg is pretty much spot on(+/-.3) when I do my own checks for my overhead O_o I do exactly as you said(that's how I was taught and reliably check it, plus my math teacher drilled averages into us for 2 weeks one year so there's no way I could forget it).

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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 02-20-2014, 03:36 PM   #30362
comptiger5000
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1998 ZJ 
 
Join Date: Jan 2009
Location: Stamford, CT / Rochester, NY
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Quote:
Originally Posted by Gearhead31 View Post
Only thing extra I'd suggest is doing that same process over several fill ups. The more readings you do, the more accurage an average you will get. Bigger sample = more reliable data.

Maybe I lucked out having 235 vs 225 tires giving the offset for good readings? The avg is pretty much spot on(+/-.3) when I do my own checks for my overhead O_o I do exactly as you said(that's how I was taught and reliably check it, plus my math teacher drilled averages into us for 2 weeks one year so there's no way I could forget it).
Accuracy of the overhead seems to be luck of the draw. Because of my bigger than stock fuel injectors, mine will always read about 10% higher than it otherwise would have, but it's off by more than that most of the time.
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Unread 02-20-2014, 03:46 PM   #30363
torchd
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1998 ZJ 
 
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Location: Chicago
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Still having problems with my Jeep
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[b]1998 Jeep Grand Cherokee Laredo[/b]
2" BB Pucks | SkyJacker Hydro Shocks | Rubicon Wheels | Cooper 245/75/16 Tires

[b][color=red]2002 Trans Am[/b][/color]
Cam, Full Exhaust, Stock Heads, Stock LS6 Intake and Stock 10 bolt with 3.42s
[b]420 RWHP and 382 RWHTQ[/b]
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Unread 02-20-2014, 03:56 PM   #30364
Gearhead31
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Quote:
Originally Posted by comptiger5000 View Post
Accuracy of the overhead seems to be luck of the draw. Because of my bigger than stock fuel injectors, mine will always read about 10% higher than it otherwise would have, but it's off by more than that most of the time.
I guess that being accurate makes up for the VIC constantly having "srvc 4wd switch" beeping nonstop for a couple years till it died recently
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 02-20-2014, 04:41 PM   #30365
roughknight69
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Got my ball joints and actuator arm today, along with renting the ball joint press and adapters. $200 to rent though :/
image-2549757574.jpg

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Build thread [url]http://www.jeepforum.com/forum/f197/roughknight69s-95-zj-build-1319907/[/url]
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Unread 02-20-2014, 04:49 PM   #30366
StPaul59
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1998 ZJ 
 
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Quote:
Originally Posted by 970001zj View Post
nope
I was referring to radean84's zj.
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Unread 02-20-2014, 05:32 PM   #30367
EndIsNear
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I've had good luck with the Fuel Log app.

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Unread 02-20-2014, 05:50 PM   #30368
93ZJDave
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Quote:
Originally Posted by zj97ltd View Post
Lol. Just wait till I post pics. I had a 93 back in 98 that wasn't this clean.
Join the club lol yeah I love my 5 speed zj one good think about mine is I stole it for 500 bucks and have been driving it daily for a few years now I actually lost track how long I had it I think back in 09 lmao mine sadly is not rust free but at least I don't have to worry about scratching or damaging it lol.
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Unread 02-20-2014, 05:58 PM   #30369
Maine1994ZJ
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Originally Posted by zj97ltd View Post
Lol. Just wait till I post pics. I had a 93 back in 98 that wasn't this clean.
To quote Judge Smails from Caddyshack: "WELLLLLL........ WE'RE WAITING......"
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Unread 02-20-2014, 06:59 PM   #30370
Hytek
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1998 ZJ 
 
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Location: Romeoville, IL
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Quote:
Originally Posted by EndIsNear View Post
I've had good luck with the Fuel Log app.
I've used Fuel Log for a couple years now and love it.

OT: more goodies arrived, Energy Suspension spring isolators. Waiting on a few more things then she's coming apart.

Also looking for a slate front bumper if anyone knows of one. Thx
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Unread 02-20-2014, 07:02 PM   #30371
ejschultz
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Quote:
Originally Posted by Gearhead31 View Post
Only thing extra I'd suggest is doing that same process over several fill ups. The more readings you do, the more accurage an average you will get. Bigger sample = more reliable data.

Maybe I lucked out having 235 vs 225 tires giving the offset for good readings? The avg is pretty much spot on(+/-.3) when I do my own checks for my overhead O_o I do exactly as you said(that's how I was taught and reliably check it, plus my math teacher drilled averages into us for 2 weeks one year so there's no way I could forget it).
Oh yeah, I'll agree with that. The more samples you have, the better. My running average, according to Fuelly, is 13.9 MPG. I've calculated a lot worse than that and also had Fuelly represent a lot lower than that. I've also had some really good tanks where I had 200 miles of highway driving that averaged quite high. To be honest, I'm surprised my Fuelly average is that high. That's tracked for over 10,000 miles as well so I'd imagine it's fairly accurate. About all of that is with my lift and maybe 5000 of it is with my 31s. All in all, I guess for what my ZJ has done to it, that's not too terrible for an average.
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Unread 02-20-2014, 07:20 PM   #30372
970001zj
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Quote:
Originally Posted by StPaul59 View Post
I was referring to radean84's zj.
i know
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Unread 02-20-2014, 08:04 PM   #30373
Myusername1674
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Quote:
Originally Posted by ejschultz View Post

Did you do it by yourself or did you get help? I did mine by myself including the hitch. That was fun. I couldn't get anyone to help me out that day. A folding chair worked well to keep things balanced on one side while I managed to get one side loosely secured.
Hahah yep did this one by myself, held the skid up with a ratchet strap then used jack stands for the hitch. Pain the *** but I got er done



sent from, uh
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Unread 02-20-2014, 08:57 PM   #30374
SchizophrenicMC
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1997 ZJ 
 
Join Date: May 2012
Location: Arlington, Texas
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Funny enough, I've never had much error in my overhead. In the Laredo, it calculated a number that was off by almost exactly the amount the tires threw off the speedometer. And in the Orvis, it shows the same 11.1mpg I've hand-calculated.

Hit or miss I think.
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Unread 02-20-2014, 09:13 PM   #30375
xrunndonex
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1994 ZJ 
 
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Location: coffeyville, Kansas
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Cut the muffler off before it fell. Cut it just after the cat ohh boy is it loud now lol. Never checked the laws for not having a muffler is ks ohh well
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