G37 Sedan

MPG Has Decreased significantly

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Old 01-09-2016, 06:42 PM
  #16  
takeapieandrun
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Strange, my car (07) has nearly the same mileage as yours but my university commute always yields me ~23 or 24 mpg at that speed despite having the less efficient 5AT/VQ35 combo. Plus, I'm stuck with crappy ethanol-mixed 91 octane in CA.

Glad to see cleaning your MAF helped, I might try that out as well.
Old 01-09-2016, 06:52 PM
  #17  
Snipres
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Originally Posted by blnewt
Yep, whatever % of ethanol is added will pretty much be how much less % mpg you'll get over non ethanol fuel. So if you were getting 30 mpg w/ non Ethanol gas you'll get 27 or less w/ a 10% Ethanol mix.

Also, are you using the dash mpg calculator or going by true mpg after going through actual gas used, it can be a dramatic difference sometimes.
I was using the indash calculator. I'll make sure to fill up sunday night, and reset my trip monday morning.

Originally Posted by takeapieandrun
Strange, my car (07) has nearly the same mileage as yours but my university commute always yields me ~23 or 24 mpg at that speed despite having the less efficient 5AT/VQ35 combo. Plus, I'm stuck with crappy ethanol-mixed 91 octane in CA.

Glad to see cleaning your MAF helped, I might try that out as well.
Very strange, stock airbox? Do you drive in manual mode?

And yes I'm soo far its all ... I was skeptical about doing the cleaning, scared to damage such a sensitive and expensive piece of equipment.. But very easy DIY.. CRC cleaner at Autozone cost me $9.00
Old 01-09-2016, 07:36 PM
  #18  
takeapieandrun
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I have a Takeda short ram. I always drive in manual mode as well. Also, I noticed you have an X which adds some hundred pounds, could also be the reason why.
Old 01-09-2016, 10:01 PM
  #19  
si_driver
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I think the actual weight diff. between G37 Journey and AWD is 254 lbs. and approx 175 lbs between the regular S version vs the X .
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