I am only getting 12 MPG
#1
#3
The reason I didn't put premium in it is because previous owner was using regular, and I didn't want to switch it cold turkey and hurt it. Is this the reason my gas mileage is awful?
#5
It is no big deal to switch gas. Lol infact there is normally no such thing as mid-grade; it's almost always mixed at the pump from regular and premium. You should notice a bit of a difference in throttle feel after about a tank. MPG probably won't be hugely affected, but you may see a bit of a bump. Sounds more like you need some maintenance done.
#6
Your fuel usage is effected by great number of things. Just consider what manufacturers do now days to meet EPA standards. Toyota uses 0w20 oil to increase fuel economy, Chevy puts huge chin spoilers on trucks to make them more air dynamic and so on.
In your case you should be getting good 19-20 city and 21-25 highway. I get that with 220k miles on the 05 coupe.
To improve your millage start with cheap things and move on to more costly ones.
Gas is number one. Gs ECM can determine octane number of fuel and adjust fuel delivery based on the octane. Lower octane fuel= more of it being pumped into the cylinders as ECM demands.
So switch to Premium asap.
I can guarantee you that you will not get a major improvement after that switch since there are more factors that effect your millage.
Friction is the worst enemy of fuel economy so you got to look at every single component of the car that has friction.
Engine -Use good quality oil to reduce friction and increase it's efficiency.
Transmission............same thing.
Differential, also needs good synthetic oil to improve friction and increase gas millage.
Wheel bearings
Tire pressure
Spark plugs - need to be in good shape to effectively burn fuel so that ECM does not dump more into the cylinders to get the BAM that it wants.
Air filter- if dirty and not enough air gets in more fuel will be burned
Also if poor fuel was used it can with age wear out fuel injectors and as a result you'll be dumping more fuel into the engine than needed and out our exhaust.
So start with small, inexpensive things and move up the latter.
In your case you should be getting good 19-20 city and 21-25 highway. I get that with 220k miles on the 05 coupe.
To improve your millage start with cheap things and move on to more costly ones.
Gas is number one. Gs ECM can determine octane number of fuel and adjust fuel delivery based on the octane. Lower octane fuel= more of it being pumped into the cylinders as ECM demands.
So switch to Premium asap.
I can guarantee you that you will not get a major improvement after that switch since there are more factors that effect your millage.
Friction is the worst enemy of fuel economy so you got to look at every single component of the car that has friction.
Engine -Use good quality oil to reduce friction and increase it's efficiency.
Transmission............same thing.
Differential, also needs good synthetic oil to improve friction and increase gas millage.
Wheel bearings
Tire pressure
Spark plugs - need to be in good shape to effectively burn fuel so that ECM does not dump more into the cylinders to get the BAM that it wants.
Air filter- if dirty and not enough air gets in more fuel will be burned
Also if poor fuel was used it can with age wear out fuel injectors and as a result you'll be dumping more fuel into the engine than needed and out our exhaust.
So start with small, inexpensive things and move up the latter.
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Blue Dream (12-25-2016)
#7
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Front and rear cameras, tire pressure for all four tires can display on screen,folding side view mir
I never use premium and get excellent mileage with my current G37S and my previous 06 G35.
Four fill-ups from NJ to Florida, two fill-ups with short local trips while in Florida and four fill-ups on the return from Florida to NJ
Another round trip to Florida
IMHO using premium gasoline is a waste of money but is good for the oil companies and their stockholders.
My G37S has never seen a drop of premium.
Telcoman
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#8
I drove ttrank's car solo
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G35 sedan w/ too much money in mods
#9
I have been thinking about it, and I have a massive exhaust leak on the flex-pipe. I am thinking with that it is sending bad readings to the o2 sensors and its causing it to run real rich*
EDIT: meant to fix that *, I was in a hurry and am at work lol.
EDIT: meant to fix that *, I was in a hurry and am at work lol.
Last edited by 03G35C6MT; 12-28-2016 at 02:23 PM.
#11
First things first, run premium gas. Technically the ECU has enough room to adjust for lesser rating fuels, but its better to not force it to make those adjustments as those adjustments are exaggerated. I'm assuming you just bought the car since you didn't want to make the fuel change when the previous owner ran regular? How many miles on the car?
Quick and easy typical maintenance things that could help:
Fix exhaust leak
Check plugs and make sure they are good and gapped properly. I'd be willing to bet they need replacing.
Check air filter
If your oil is old, change it and use recommended oil
Make sure tires are at proper pressure
Check e-brake tension (may be dragging)
Keep your foot out of the throttle
#14
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Blue Dream (01-05-2017)
#15