Solstice GXP - IC/Catless/Tuned = >30mpg? - Other Cars Forum

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Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 4:37 AM
I don't know if the car is just breaking in, or if it's a result of the modifications (Hahn IC, catless open DP, my hpt tune) but this car is now getting amazing gas mileage! I noticed a big chang when going catless.

The car used to do about 26-28mpg. Last two tanks have been 30mpg, that includes on-ramp fun and 100mph+ freeway pulls. That's about 1/3 back road and 2/3 highway. This tank I've been going a little easier, and the trip is indicating i should get closer to 35mpg (460-ish miles on the tank). Wonder what it would to if i stay out of boost for a whole tank? Who needs a Prius?? lol. I <3 direct injection and this car
Cliffnotes - you don't have to sacrifice performance for economy, just get yourself and LNF


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Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 1:50 PM
oldskool wrote:I don't know if the car is just breaking in, or if it's a result of the modifications (Hahn IC, catless open DP, my hpt tune) but this car is now getting amazing gas mileage! I noticed a big chang when going catless.

The car used to do about 26-28mpg. Last two tanks have been 30mpg, that includes on-ramp fun and 100mph+ freeway pulls. That's about 1/3 back road and 2/3 highway. This tank I've been going a little easier, and the trip is indicating i should get closer to 35mpg (460-ish miles on the tank). Wonder what it would to if i stay out of boost for a whole tank? Who needs a Prius?? lol. I


I call BS, there is no road in Berks County capable of 100mph without death by catapult out of seat.

Awesome mpg though, reminds me of why I hate my cav once again,



Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 2:43 PM
I get 23... at best... but mine sounds better so ha!

But really, that's awesome and rather impressive!



Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 3:09 PM
i saw your profile says 320hp, is that on the current setup and tune? if so, that's awesome fuel economy, especially for the amount of performance you're getting out of it.





Check out my build thread!

Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 3:27 PM
Are you going by the DIC for those averages or calculating at the pump?







Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 3:33 PM
not surprising



1989 Turbo Trans Am #82, 2007 Cobalt SS G85





Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 3:57 PM
I don't really pay attention to the milleage on my Solstice.

I can't complain.

The low compression and small displacement go a long way with milleage. DI surely adds benefit.





Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Thursday, June 17, 2010 8:23 PM
Mike Demo (Civic Eater) wrote:
oldskool wrote:I don't know if the car is just breaking in, or if it's a result of the modifications (Hahn IC, catless open DP, my hpt tune) but this car is now getting amazing gas mileage! I noticed a big chang when going catless.

The car used to do about 26-28mpg. Last two tanks have been 30mpg, that includes on-ramp fun and 100mph+ freeway pulls. That's about 1/3 back road and 2/3 highway. This tank I've been going a little easier, and the trip is indicating i should get closer to 35mpg (460-ish miles on the tank). Wonder what it would to if i stay out of boost for a whole tank? Who needs a Prius?? lol. I


I call BS, there is no road in Berks County capable of 100mph without death by catapult out of seat.

Awesome mpg though, reminds me of why I hate my cav once again,
maybe in a lowered cav - kappa's hold the road

RuggedZ wrote:i saw your profile says 320hp, is that on the current setup and tune? if so, that's awesome fuel economy, especially for the amount of performance you're getting out of it.
Airflow readings indicate about 320-ish hp. never dynoed, but readings are constant with others with similar mods/boost

FstCavZ24 wrote:Are you going by the DIC for those averages or calculating at the pump?
Calculating at the pump - only way to be accurate. miles since last complete fill up divided by gallons for complete fill up. Did 32mpg on the last tank. DIC average was at 30.8, but it's a long running average. I haven't figured out if it clears memory after a certain amount of miles/time or just keeps averaging until the user resets

Rodimus Prime wrote:not surprising
eco FTW!!



Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Friday, June 18, 2010 4:49 AM
it will go until the user resets. it is a lifetime average if it is the same system as my trailblazer




Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Friday, June 18, 2010 8:22 PM
my 97 sunfire gets 30 mpg and is a 3 speed auto.



FU Tuning



Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Friday, June 18, 2010 8:54 PM
Craig Lewis wrote:The low compression and small displacement go a long way with milleage.
The small displacement obviously improves mileage. However, high compression will yield better mileage, not lower compression, since you're making more power on the same amount of air/fuel.

I'm betting it's going catless that's really doing most of it for you. Since it's a boosted engine, you're not at all worrying about exhaust losing velocity at low and mid RPMs like you would with an NA car. The IC is probably helping, since you have less pressure loss (I'm guessing the new IC flows better). Still impressive numbers considering you're not babying it.







Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Saturday, June 19, 2010 2:48 AM
Screaming for Mercy!! wrote:my 97 sunfire gets 30 mpg and is a 3 speed auto.
lol and i once got 42 mpg with my 2002 LN2, but neither of these cars made ~300hp.
Last tank was a solid 32mpg on the solstice



Re: Solstice GXP - IC/Catless/Tuned = >30mpg?
Saturday, June 19, 2010 4:31 AM
You don't need much power to cruise.

LNF kappas with tunes are getting amazing milleage. regardeless of hardware mods.

I should start logging my milleage.

It's a great example of how cats are not entirely cost efective, especially in lean running clean burning DI cars.



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