[hfdad]

At about 2400 mi. I did an oil change and switched to Pennzoil synthetic. At the time my DIC average fuel mileage was 19.5 or so. I reset it after doing the oil change and after about 300 mi. of driving it is 20.5. My driving has not changed and the weather is the same too. Could the oil give me slightly better mileage?

 

[INNOCNT]

Yes, absolutely,
Will also improve by running 100% synthetic lubricants in the rest of your drivetrain from front to back - transmission, differentials etc.
Some even choose fully synthetic grease for axle bearings to lower the coefficient of friction.
The less resistance you have in your engine and throughout your powertrain down to the axle hubs, the less energy it takes to roll.[/color]

 

[Terra-Nox]

At about 2400 mi. I did an oil change and switched to Pennzoil synthetic. At the time my DIC average fuel mileage was 19.5 or so. I reset it after doing the oil change and after about 300 mi. of driving it is 20.5. My driving has not changed and the weather is the same too. Could the oil give me slightly better mileage?

How many miles on DIC before you reset it?

 

[INNOCNT]

How many miles on DIC before you reset it?

At about 2400 mi.

 

[Terra-Nox]

I read that, what I was attempting to ask is if that was the FIRST reset, or if not how many miles on the last reset before switch.

 

[INNOCNT]

I read that, what I was attempting to ask is if that was the FIRST reset, or if not how many miles on the last reset before switch.

Ahh gotcha! We'll have to wait for the answer I guess[/color]

 

[jstpsntym]

Yes, absolutely,
Will also improve by running 100% synthetic lubricants in the rest of your drivetrain from front to back - transmission, differentials etc.
Some even choose fully synthetic grease for axle bearings to lower the coefficient of friction.
The less resistance you have in your engine and throughout your powertrain down to the axle hubs, the less energy it takes to roll.[/color]

OMG...I think that is the worst color to use for text on this board!

 

[INNOCNT]

OMG...I think that is the worst color to use for text on this board!

Sorry, my bad!! Lol Just like changing things up once in awhile.
But yes, that is a bad color isn't it?
K, no more green. [/color]

 

[jstpsntym]

Sorry, my bad!! Lol Just like changing things up once in awhile.
But yes, that is a bad color isn't it?
K, no more green. [/color]

Agreed! ;D

 

[hfdad]

How many miles on DIC before you reset it?

I have only reset the DIC a few times over those 2400 mi. so the last reset probably was around 2000. That is my best guess. I have the 4 cyl. engine too.

 

[Sgt1411]

If the use of synthetic lubricants can increase MPG with those results why wouldn't GM use them?

They are choosing tires with lower roll resistance and making any small change to increase mileage.

The Federal Government is hammering them for increased MPG with CAFE requirements.

Cost couldn't be that much different with the volume they would be buying.

 

[LS3Vette]

1st, I use Mobil1 5-30 synthetic in all my cars and have for many years. 2nd, While synthetic might increase mpg's the gain would be very hard if not impossible to measure... 3rd, most of the dexos approved oils are at least a synthetic blend...

 

[RIT333]

If the use of synthetic lubricants can increase MPG with those results why wouldn't GM use them?

They are choosing tires with lower roll resistance and making any small change to increase mileage.

The Federal Government is hammering them for increased MPG with CAFE requirements.

Cost couldn't be that much different with the volume they would be buying.

Excellent points. If they could increase MPG by even 1 MPG for maybe $5 per car, they would be all over that. Possibly, the benefits of synthetic show up more when the oil is older/used up. Or, maybe they do the EPA test with Synthetic, and then don't install it in the cars - to save $5 per car. That would make the most sense !

 

[buickx]

Just had oil changed.....All 2011 Terrains factory oil (GM) on bottle, are 50% synthetic oil....thay's straight from the horses mouth....