Author Topic: Gas Mileage Thread  (Read 76870 times)

0 Members and 6 Guests are viewing this topic.

Offline Jeffy

  • Administrator
  • Member
  • Posts: 14934
Re: Gas Mileage Thread
« Reply #195 on: March 16, 2011, 11:23:39 PM »
it was a rough calc. from fill up to nearly empty. i know it's not the most accurate way to calculate it, but it gives me a rough estimate. sometimes ill calc it to half tank as a rough look.
How'd you calculate your mileage then?  With the speedo off your odometer will also be off.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline sharpxmen

  • Chief Squirrel Blower®
  • Member
  • *
  • Posts: 7093
Re: Gas Mileage Thread
« Reply #196 on: March 16, 2011, 11:51:15 PM »
it was a rough calc. from fill up to nearly empty. i know it's not the most accurate way to calculate it, but it gives me a rough estimate. sometimes ill calc it to half tank as a rough look.

that's not the way to do it though, you fill up, drive about 200 miles then fill up again, divide the miles between fill-ups to the gallons you put in the last fillup and you get your mpg. Otherwise you don't know if you have 1 or 3 gallons left in the tank and that can be the difference you're looking for (like 15 to 18 mpg for that 2 gallon difference). 1/2 tank is even more inaccurate as the sender is very loose in indication.
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline stan98tj

  • Empty Wallet Wheeling Since 2007®
  • Member
  • *
  • Posts: 1816
  • Wheeling New England
Re: Gas Mileage Thread
« Reply #197 on: March 17, 2011, 02:55:18 PM »
How'd you calculate your mileage then?  With the speedo off your odometer will also be off.
used my gps for milage
98 TJ 35"Maxxis Trep.Old Man Emu 2.5""+1"BL,IronMan Fab control arms,4.56gears,Ford 8.8+ARB,Currie/IronMan steering, WARN VR10,HP D30 sleeved+ RCV,Body Armor Rock Rails WISHLIST:TDi.Girlfriend hates it :) If you can read this don't flip me over i dont have any $$ left to fix it

Offline sharpxmen

  • Chief Squirrel Blower®
  • Member
  • *
  • Posts: 7093
Re: Gas Mileage Thread
« Reply #198 on: March 17, 2011, 04:31:40 PM »
used my gps for milage

that is also not accurate (unless the road you drive is a perfect straight line), odometer or known distance on the hwy is the way to do it.
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline Jeffy

  • Administrator
  • Member
  • Posts: 14934
Re: Gas Mileage Thread
« Reply #199 on: March 17, 2011, 04:45:07 PM »
used my gps for milage
I don't think a GPS is a good way to calculate your mileage.  Unless you wait for the GPS to connect, you'll get inaccurate numbers.  A GPS is also only accurate up to 15 meters as well.

What you want to do is replace the speedometer gear so it's within 1-2MPH.  Then fill up and drive till you need to fill up again.  Do this a few times and make sure you don't top off.  This will give you more accurate numbers.  Then if you want to get anal about it, get something like the OBD-II ScanGauge II which can give you real time mileage.  This is the one feature I wish my Jeep had.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline sharpxmen

  • Chief Squirrel Blower®
  • Member
  • *
  • Posts: 7093
Re: Gas Mileage Thread
« Reply #200 on: March 17, 2011, 05:29:58 PM »
I don't think a GPS is a good way to calculate your mileage.  Unless you wait for the GPS to connect, you'll get inaccurate numbers.  A GPS is also only accurate up to 15 meters as well.

What you want to do is replace the speedometer gear so it's within 1-2MPH.  Then fill up and drive till you need to fill up again.  Do this a few times and make sure you don't top off.  This will give you more accurate numbers.  Then if you want to get anal about it, get something like the OBD-II ScanGauge II which can give you real time mileage.  This is the one feature I wish my Jeep had.

what do you mean by "don't top off"?
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline Jeffy

  • Administrator
  • Member
  • Posts: 14934
Re: Gas Mileage Thread
« Reply #201 on: March 17, 2011, 05:30:50 PM »
what do you mean by "don't top off"?
Top off the tank with gas.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline brokenwrist21

  • Member
  • Posts: 58
Re: Gas Mileage Thread
« Reply #202 on: March 31, 2011, 11:15:16 PM »
mileage varies wildly from about 12 to about 14.5 mpg's
ax5 manual, synchromesh fluid
amc 2.5mpfi, pennzoil platinum full synthetic oil
bfg mud terrain ta/km 33x10.50r15
4.88 synthetic rear diff lube.
spedo calibrated
4.0l tb, tb spacer, k&n drop in air filter, flowmaster muffler, high flow cat, msd 8.5mm super conducter wires, bosch iridium +4 plugs,rv cam from delta camshafts, yella terra roller rockers.
'93 yj 4in rubicon express lift, 33" bfg mud terrains, yella terra roller rockers, 4.0l throttle body, rv cam, k&n air filter, yukon axles and gears, detroit locker, aluminum radiator, msd 8.5mm super conductor wires, full syn. fluids.

stevenu

  • Guest
Re: Gas Mileage Thread
« Reply #203 on: April 01, 2011, 05:20:02 PM »
Tried out 93 octane last fill up at 3.799. pulled 18 mpg.

2.5
AX-5
31x10.5
throttle body and spacer
dynomax cat back
speedo calibrated
KnN drop in filter


Torch_Ind

  • Guest
Re: Gas Mileage Thread
« Reply #204 on: April 01, 2011, 05:44:03 PM »
Tried out 93 octane last fill up at 3.799. pulled 18 mpg.

2.5
AX-5
31x10.5
throttle body and spacer
dynomax cat back
speedo calibrated
KnN drop in filter




does that make it worth paying more?

Offline sharpxmen

  • Chief Squirrel Blower®
  • Member
  • *
  • Posts: 7093
Re: Gas Mileage Thread
« Reply #205 on: April 01, 2011, 05:50:08 PM »
Tried out 93 octane last fill up at 3.799. pulled 18 mpg.

2.5
AX-5
31x10.5
throttle body and spacer
dynomax cat back
speedo calibrated
KnN drop in filter



what were you getting with regular (87)?
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

stevenu

  • Guest
Re: Gas Mileage Thread
« Reply #206 on: April 01, 2011, 07:04:50 PM »
Last 87 octane was 16.3mpg.  It works out in my favor paying more but just barely. Please know that this is my first Jeep and my first standard, I'm still figuring the best way to get around. I know in my 4 runner it helped running a higher octane so I'm trying it out. I will post again when i fill up next with 87.

Offline stan98tj

  • Empty Wallet Wheeling Since 2007®
  • Member
  • *
  • Posts: 1816
  • Wheeling New England
Re: Gas Mileage Thread
« Reply #207 on: April 15, 2011, 10:14:37 AM »
really I get 15 with mods and 6inches of lift 4.88's and 33's with open front fenders and a bit top light bar.. I could prob squeeze 17ish if I was easy on it in nice weather and flat strait roads.

also I did a mpg check when I was stock with 31's pulling a small trailer with a min z on it. and all our gear in the jeep we got roughly 22mpg

what do you got for a build ??
also do you run a/c
let it idle a lot?
clutch fan stuck?

stock fan. no a/c. 33s 3.25" lift. 3spd auto. 62mm Tb/spacer. aem intake. banks header and catback. high flow cat.
98 TJ 35"Maxxis Trep.Old Man Emu 2.5""+1"BL,IronMan Fab control arms,4.56gears,Ford 8.8+ARB,Currie/IronMan steering, WARN VR10,HP D30 sleeved+ RCV,Body Armor Rock Rails WISHLIST:TDi.Girlfriend hates it :) If you can read this don't flip me over i dont have any $$ left to fix it

RockinH5

  • Guest
Re: Gas Mileage Thread
« Reply #208 on: April 27, 2011, 10:01:05 PM »
Fully stock 2.5L YJ on 31x10.50 getting about 16-18mpg.

Offline Jeffy

  • Administrator
  • Member
  • Posts: 14934
Re: Gas Mileage Thread
« Reply #209 on: May 04, 2011, 11:24:29 PM »
Well, the on the last tank of gas I got 17.5 mpg.  Seems to get better mileage as I run the tank dry.  I got over 300 miles out of the tank with 1-2 gallons left.  I think the most I've dared to do was around 330 miles.  On average I've been getting 15 mpg city for the last 3-4 years.  Before that it was 16-18 with a lot of highway driving.  It will be interesting to see how it changes with the new tires.  Although my speedometer is off by a small amount.  I should still be able to get an idea of the mileage since I know how off it is.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."