highest MPG in years and w/4.08
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maxwell867
- Posts: 39
- Joined: Tue Jan 31, 2006 12:20 pm
- Car: 1996 q45
Re: highest MPG in years and w/4.08 (jamesmost)
not bad, i thought it would be less. I'm definately considering installing 4.08 rear.
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jamesmost
- Posts: 1963
- Joined: Tue Jul 08, 2003 10:16 am
- Car: "95Qmodded, Benz wagon 4matic , 1986 MB 560sec
Re: highest MPG in years and w/4.08 (maxwell867)
that was only one tank calculation, more to follow after weekendmaxwell867 wrote:not bad, i thought it would be less. I'm definately considering installing 4.08 rear.
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elwesso
- Posts: 30810
- Joined: Sun Feb 23, 2003 4:52 pm
- Car: 94 Infiniti Q45t 5 spd
2007 BMW M Coupe
2007 Infiniti G35 S 6MT - Location: Indiana
- Contact:
Re: highest MPG in years and w/4.08 (jamesmost)
James your a madman.
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FarFetched
- Posts: 946
- Joined: Wed Feb 02, 2005 4:34 pm
- Car: Suzuki SV1000S.
Re: highest MPG in years and w/4.08 (jamesmost)
I was getting 17-18 Mpg when I did 4.08 swap with almost 40-60 hwy-city driving. At least 2-3 WOT per day to clear carbon deposits from pistons/chambers If everything goes as planned, at the end of this year I might get 00-01 Y33 non-T
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ddrumman
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- Car: 08 FX35 39,000 mi, 07 G35 55,500 mi, 72 MGB
- Location: West Hills CA
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Re: highest MPG in years and w/4.08 (FarFetched)
Just filled up today.
It took 17.5 gallons at $3.479 per gallon and the odometer was reading 230 miles. 13.14 mpg. $60.95
It sucks but that's how it goes. No 4.08.
It took 17.5 gallons at $3.479 per gallon and the odometer was reading 230 miles. 13.14 mpg. $60.95
It sucks but that's how it goes. No 4.08.
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elwesso
- Posts: 30810
- Joined: Sun Feb 23, 2003 4:52 pm
- Car: 94 Infiniti Q45t 5 spd
2007 BMW M Coupe
2007 Infiniti G35 S 6MT - Location: Indiana
- Contact:
Re: highest MPG in years and w/4.08 (FarFetched)
did you factor in the 10% difference in speedo?FarFetched wrote:I was getting 17-18 Mpg when I did 4.08 swap with almost 40-60 hwy-city driving. At least 2-3 WOT per day to clear carbon deposits from pistons/chambers If everything goes as planned, at the end of this year I might get 00-01 Y33 non-T
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maxnix
- Posts: 22627
- Joined: Mon Jul 22, 2002 8:11 pm
- Car: 1995 Infiniti Q45
1995 Infiniti Q45t
2000 Infiniti Q45
Re: highest MPG in years and w/4.08 (elwesso)
Actually, Wes meant odometer.elwesso wrote:did you factor in the 10% difference in speedo?
If you weren't cruising at 130mph+ or at WOT everytime you touched the gas, then something was way off.
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Q45tech
- Moderator
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- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: highest MPG in years and w/4.08 (maxnix)
Isn't amazing how closely HIGHWAY MPG tracts with diff gear [rpm] ratio changes.
If we didn't haul passengers or need AC the Q could probably get by in flat low altitude driving with a 10% reduction [1800 rpms at 60 mph] a 3.185:1 rear diff gear.
If we didn't haul passengers or need AC the Q could probably get by in flat low altitude driving with a 10% reduction [1800 rpms at 60 mph] a 3.185:1 rear diff gear.
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FarFetched
- Posts: 946
- Joined: Wed Feb 02, 2005 4:34 pm
- Car: Suzuki SV1000S.
Re: highest MPG in years and w/4.08 (elwesso)
Of course!Average 280-290 miles per fill (approx 17 gal) I still have sales slips (I keep them as sentimental value ). That's given 10 % difference in axle ratio!Cheers!
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jamesmost
- Posts: 1963
- Joined: Tue Jul 08, 2003 10:16 am
- Car: "95Qmodded, Benz wagon 4matic , 1986 MB 560sec
Re: highest MPG in years and w/4.08 (FarFetched)
is my odo off by 5% as well as my speed ??
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Q45tech
- Moderator
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- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: highest MPG in years and w/4.08 (jamesmost)
A 4.083 with a standard speed gear has a speedometer off 15.4%......... of course the odometer is also off by the same amount.
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jamesmost
- Posts: 1963
- Joined: Tue Jul 08, 2003 10:16 am
- Car: "95Qmodded, Benz wagon 4matic , 1986 MB 560sec
Re: highest MPG in years and w/4.08 (Q45tech)
i have a 3.90 speed gear more like 5% thus my mpg really like 15.2mpg which is close to my former average of 15.36Q45tech wrote:A 4.083 with a standard speed gear has a speedometer off 15.4%......... of course the odometer is also off by the same amount.