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11-07-09, 01:28 AM
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#1 (permalink)
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250+ Club
Join Date: Apr 2009
Location: 54°17'N 130°23'W
Posts: 268
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Am I calculating my fuel economy right?
So I have a few questions to ask about calculating both fuel economy and how my speedometer correction affects my economy.
I topped the tank
449kms 70.22L total
95L Tank
I got 15.64L/100kms.
Now for my speedometer correction.
the stock tire for an 80 is a 270/75/16 as far as i know.
I have a 3 inch lift and i am running 285/75/16.
I know traveling at ~94km/hour i am really traveling at 100km/hour
what am I missing to calculate an accurate L/100kms?
or am i doing it right and thats my true fuel economy?
__________________
1992 HDJ81 VX Limited - 1HD-T - 3 inch Lift - 285/75R/16 - 3 inch exhaust - Triple Locked - Factory Winch - Cooler/Ice Maker Center console
1991 HZJ73 FRP Top ZX Limited - 5spd - Factory Locked - (Dads Rig)
FOR SALE 1985 BJ70 - 4.11s - OMEd FOR SALE
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11-07-09, 01:36 AM
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#2 (permalink)
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250+ Club
Join Date: Jan 2007
Location: In a 60 DOWN BY THE RIVER!!
Posts: 983
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 EDITED. Pinhead caught my stupid error!
If your speedo indicates 94km/hr when true speed is 100km/hr, multiply your indicated kilometers traveled by 100/94 = 1.06. Then calculate fuel economy as standard (divide distance traveled by fuel used).
In your example:
449km indicated x 1.06 = 475.94 true kilometers traveled
475.94km / 70.22 liters = 6.78 km/l
Butt
__________________
Arcata, CA
7/85 FJ60 276K
For sale - 2f carb
Last edited by Butt Ugly Chuck; 11-07-09 at 02:28 AM.
Reason: midnight math stupidity
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11-07-09, 01:53 AM
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#3 (permalink)
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250+ Club
Join Date: Apr 2009
Location: 54°17'N 130°23'W
Posts: 268
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thanks butt ugly chick!
__________________
1992 HDJ81 VX Limited - 1HD-T - 3 inch Lift - 285/75R/16 - 3 inch exhaust - Triple Locked - Factory Winch - Cooler/Ice Maker Center console
1991 HZJ73 FRP Top ZX Limited - 5spd - Factory Locked - (Dads Rig)
FOR SALE 1985 BJ70 - 4.11s - OMEd FOR SALE
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11-07-09, 02:07 AM
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#4 (permalink)
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Forum Lifer
Join Date: Feb 2002
Location: OC, CA
Posts: 6,511
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Since you have larger tires, you go farther than the odometer indicates by 6%, so 449 times 1.06 = 476 km, or 14.74 L/100Km.
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11-07-09, 02:33 AM
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#5 (permalink)
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250+ Club
Join Date: Jan 2007
Location: In a 60 DOWN BY THE RIVER!!
Posts: 983
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 Pinhead caught my error . You're traveling further and faster than your speedo indicates, not less. Edited my post above.
Butt
__________________
Arcata, CA
7/85 FJ60 276K
For sale - 2f carb
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11-07-09, 05:04 AM
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#6 (permalink)
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Forum Lifer
Join Date: Feb 2004
Posts: 11,932
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MPG Fuel Consumption Calculator - eForecourt.com
I purchased 70.22 Litres of fuel, and I drove 475 kilometres.
Your calculated fuel consumption is 19.11 MPG
which BTW is shitty fuel mileage for a diesel, what speeds where you driving, the terrain and the conditions.
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11-07-09, 03:07 PM
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#7 (permalink)
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250+ Club
Join Date: Apr 2009
Location: 54°17'N 130°23'W
Posts: 268
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Quote:
Originally Posted by crushers
MPG Fuel Consumption Calculator - eForecourt.com
I purchased 70.22 Litres of fuel, and I drove 475 kilometres.
Your calculated fuel consumption is 19.11 MPG
which BTW is ****ty fuel mileage for a diesel, what speeds where you driving, the terrain and the conditions.
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it was just below quarter when i filled it up. 140kms of that was steady highway driving cruise control at 94kms on the speedo aka 100kms/h
the rest of the kms were shitty prince rupert hilly stop go driving.
__________________
1992 HDJ81 VX Limited - 1HD-T - 3 inch Lift - 285/75R/16 - 3 inch exhaust - Triple Locked - Factory Winch - Cooler/Ice Maker Center console
1991 HZJ73 FRP Top ZX Limited - 5spd - Factory Locked - (Dads Rig)
FOR SALE 1985 BJ70 - 4.11s - OMEd FOR SALE
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11-07-09, 03:27 PM
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#8 (permalink)
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Forum Lifer
Join Date: Feb 2004
Posts: 11,932
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LOL!!
140 k/h...
actually that is decent fuel mileage at that speed!!
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11-07-09, 03:27 PM
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#9 (permalink)
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Forum Lifer
Join Date: Feb 2004
Posts: 11,932
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LOL!!
140 k/h...
actually that is decent fuel mileage at that speed!!
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11-07-09, 03:58 PM
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#10 (permalink)
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Forum Lifer
Join Date: Mar 2003
Location: Camas, WA USA
Posts: 4,267
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Quote:
Originally Posted by crushers
LOL!!
140 k/h...
actually that is decent fuel mileage at that speed!!
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Re-read, 100km/h 
__________________
Ben Silva
IH8MUD Site Supporter since July 2004
1996 Lexus LX 450, 144k, locked, Cooper STT 285s, OME 850/863, Slee Blue CC bushings, CDL/Pin 7, LandTank MAF, Powerstop rotors/EBC Green pads/Slee SS brake lines, Slee headlight harness, HIR mod, DIY installed Viper Remote start/alarm system, Mot JDM passenger grab bar, 30qt freezer, 2@aux fuse blocks, aux powerpoint, 850w inverter
1998 Lexus LX 470, 139k Sold
1993 FZJ80 198k miles Sold
My writeups:
HOW TO: DIY Remote Start/Alarm/Keyless Entry
John Deere HIR bulb mod
HOW TO: Fix your leaky windshield
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11-07-09, 05:29 PM
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#11 (permalink)
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Forum Lifer
Join Date: Feb 2004
Posts: 11,932
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ooops, my dyslectic side is showing again... i read 140 k/h for 100 km... duh.
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11-07-09, 08:52 PM
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#12 (permalink)
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Forum Regular
Join Date: Aug 2007
Location: Chilliwack, BC
Posts: 241
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I like this fuel milage calculator, gives the l/100km and imp. mpg Fuel economy calculator litres per kilometre miles per gallon kilometer
Your milage is pretty low. I get around 23-24 mpg mixed driving, and up to 26mpg easy on the highway. Since you just got it, drive it around for a while, and you might find it gets better. I know mine did. I figure it probably hadn't been driven much for a while before it was sent to Canada.
__________________
'91 HDJ 81: 1HD-T diesel. Triple lockers.
'03 VW Golf.  mobile
Check out the (gradual) progress of my build in My ROTF
My Profile (regular link no workie)
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11-07-09, 09:14 PM
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#13 (permalink)
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250+ Club
Join Date: Sep 2006
Location: Calgary Alberta Canada
Posts: 815
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Thanks for that website Wayne!!
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Darren
97 FZJ80,OME J's, ARB, SLEE with Gas Carrier Swing Out, 38 Gal. Fuel Cell, Warn 8K, CDL & Pin7, 285 BGF AT's, Hella Lights, AO Roof Rack, Water On Board
1999 Ford Mustang SVT Cobra
Calgary, Ab. Canada
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Butt Ugly Chuck
1991 Toyota HDJ81
