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Cadillac STS-V Black/Black
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Discussion Starter #1
This car seems to get worse gas mileage than my supercharged truck which is a Ford 5.4 engine 445 HP and 4x4 heavy!!!

If I stay out of the boost what should i be getting. I plan on taking a drive to NC this weekend so I seriously hope the mileage improves.
 

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Cadillac STS-V Black/Black
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Discussion Starter #3
Avg ? 15 city / 21-22 hwy @ 75-80mph That's driving pretty sane.

Everything else is down from there.

Okay I was getting about 250 miles on a tank but that could have been because of the bad cat?

I will post back after my trip and see if things improve.

Thanks
 

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2014 AWD 2.0 Obsession Red --Black 2007 STS-V
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My daily routine is 70% highway . Average so far 14.8 .:bouncy:
Getting ready for a trip, 700 highway miles each way , will update in a week when I get back.
Same trip in a 1998 SLS I was getting 23-25 .
My daughters 1997 Formula 350 Firebird gets 27 on the trip ...2.73 gear helps like 1500 rpm at 70.:cool2:
I have never seen the STS-V get to 20+ on the instant MPG for more than a few seconds at a time even crusing at 70 mph.
 

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Cadillac STS-V Black/Black
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Discussion Starter #6
^ yeah those F-bodys get surprisingly good gas mileage. My BMW 745i Sport got around 18 in town and 26 on the highway.

My Turbo Grand prix gets a little better than that and my Towncar gets about 17 city 24 highway.

I was hoping with engine advancments the STS-V would fare a little better in the economy dept but what do I expect with a supposed 469 hp.

That said does it really feel like 469 hp to you guys. Not to me but i still love the car.
 

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2006 STS-V (Light Platinum/Tango) *SOLD*
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140 Posts
It's definitely not a miser. I got around 20 mpg on the drive from Chicago to Calgary, CAN. I doubt I'll ever get those numbers now that I use it exclusively for around-town cruising (on weekends!) Did you not know the 14/20 EPA ratings when you bought?

My daily driver is a 361bhp Pontiac G8 GT and the STS-V is way faster, but doesn't "feel" more powerful, but it is...does that make sense?
 

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This car seems to get worse gas mileage than my supercharged truck which is a Ford 5.4 engine 445 HP and 4x4 heavy!!!

If I stay out of the boost what should i be getting. I plan on taking a drive to NC this weekend so I seriously hope the mileage improves.
First of all, it probably only seems like it gets worse mileage than your Ford because your Ford, no doubdt, has a larger tank by 10 gallons. I know it my truck seems like that too.

2nd, city diving is WAAAY worse than hyway driving as far as mileage. Here in L.A. where even freeway driving is city driving, my mileage is 9-12 mostly. When I take a trip, usually 150 - 250 miles, I've seen it average over 20.1 once...maybe because the wife and I don't really drive like 57 year olds(70,80,90 most trips).Even our previous car, '99 STS got similar mileage, almost exactly.

3rd, Y'all don't know nuthin' about bad mileage, my 1991 454SS, which was stolen from me 1 1/2 years ago, or I'd still have it, got 6-9 mpg, 13 hyway the whole time I had it, 10 years...and I loved it!...I just didn't drive it everyday.:thepan:
 

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2007 Cadillac STS V and 2012 CTS V Sedan BD Corsa
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14mpg around town...on the gas quite a bit.
17-21 highway.
Hi John,
my STS V here in Germany is very special, only five V`s registered here.
I have the export model, here are my numbers:

around town about 16.5 liters/100 km = 14,2 mpg
speed from 80 - 115 kph ( 50-70 mph) around 13 liters/100 km = 18 mpg
on hard Autobahn rides most between 160 - 290 kph (100 - 180 mph) around 18 liters/100 km = 13 mpg

This numbers not bad for a 476 hp car (german horsepower rating) but the gas tank should be bigger.

On fast moving Autobahn trips I have to refill mostly all 200 miles.

But I love my V, best car I`ve ever owned!!!!!:thumbsup::thumbsup::thumbsup:

Harry
 

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2006 STS-V (Light Platinum/Tango) *SOLD*
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In highschool, I drove a '77 New Yorker with a 440. I was lucky to get 5 mpg, and I'm not even joking! I guess it's all relative. I do find the tank in the STS-V a bit small.
 

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Formerly 06 STS-V, now 13 XTS
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536 Posts
Hi John,
my STS V here in Germany is very special, only five V`s registered here.
I have the export model, here are my numbers:

around town about 16.5 liters/100 km = 14,2 mpg
speed from 80 - 115 kph ( 50-70 mph) around 13 liters/100 km = 18 mpg
on hard Autobahn rides most between 160 - 290 kph (100 - 180 mph) around 18 liters/100 km = 13 mpg

This numbers not bad for a 476 hp car (german horsepower rating) but the gas tank should be bigger.

On fast moving Autobahn trips I have to refill mostly all 200 miles.

But I love my V, best car I`ve ever owned!!!!!:thumbsup::thumbsup::thumbsup:

Harry
Oh... if ONLY we could legally drive that fast here....

I think American interstates need V-only lanes. Heck... I might be generous enough to share with Mercedes AMG series too if they play nice.
 

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2007 Cadillac STS V and 2012 CTS V Sedan BD Corsa
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Oh... if ONLY we could legally drive that fast here....

I think American interstates need V-only lanes. Heck... I might be generous enough to share with Mercedes AMG series too if they play nice.
Hallo Mr. Hemmerich:)

V lanes only in the US. sounds cool but we have here on some Autobahn parts very hard traffic. I`m still able to do distance of 200 miles in less than two hours with my V, what means an average of 100+ miles per hour.

BTW, remember the rattling noise, it was the rear speaker on back of the center console.

Harry
 

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STS-V
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My turbo 418ci TBSS (low compression) gets better gas mileage at 60-70.. Thats with a 4spd too! The car's tune seems to love to dump fuel at any boost level. I'd attribute the gas mileage more to the compression ratio, my tbss used to get 24mpg before I put the 418 low compression in. Now I can only get 20-21 if I am very easy on it.. This is thanks in part to running open loop at AFR above 14.7. No cats.. Completely different from V. BTW.. I think this is my first post. I just picked up my used 2007 STS-V 3 days ago. :)
 

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2014 AWD 2.0 Obsession Red --Black 2007 STS-V
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Just back from New Mexico road trip. 1700 miles average was 21.8:bouncy:
Car computer was a little optomistic at 22 compared to reciepts divided by mileage driven.
95% of miles were cruising at posted limit +/- 10 .
about 100-125 miles of in town driving ... Albaqurque is all hills .
I did get an opportunity for about 8 miles straight at 100-110 range :shhh:
I will have to say the car does better in the 75-85 MPH range than it does in the 65-75 range, when it comes to hills the rpms seem to low at 65 & causes the boost to come on alot just to maintain, at 85, just a few hundred rpm higher and it was able to pull the hills easier:bonkers:
 

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I've only got about 23k on my '06 STS-V and about 60% of those are Highway. I have never reset my average mileage readout, and it is reading 19.4 at the moment. I drive it pretty reasonably most of the time, but am know to jump on it especially when passing on a two lane. I also show off a little around town, but not a lot. I did do the V-Performance Acadamy,at Road Atlanta and that was absolutely awsome, so I do now what this thing will do. Obviously not an everyday driver, but I'm getting ready to show it off some today. :)
 

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STS-V
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The programming on this car is strange.. It enters PE mode (power enrichment) at the slightest bit of throttle.. and PE mode is delayed for anything under 8192rpm.. pe mode is enabled at anything above 0 rpm.. The enrichment rate is set at .2 (very low).. If you are familiar to most gm programs.. this isn't usually how things are done.. Then again, I haven't seen too many factory SC'd apps.

Even so, just by scanning you can see how touchy the injectors can get.. I'd say anything under 2k rpm is rather inefficient.. unless of course its steady smooth, no boost throttle. Our open loop fueling is just as thirsty.. I can't really get a feel for how accurate our MAF curve is until I get this on a dyno and in open loop.. among other things.
 
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