: Fuel economy 2007 sts V8



97C2S
09-26-07, 06:40 PM
I would appreciate hearing what mileage range you're getting from the V8 STS. Also, is there a big difference between all wheel and rear wheel drive? I'm trying to deside between the 6 and 8 cylinder. Thanks in advance for your input.

MARKVIII
09-26-07, 06:46 PM
19.5__________60% highway, 40% around town

Skibanker
09-26-07, 07:50 PM
I get 19 in the city with my 6 banger AWD

Onalaska
09-26-07, 09:39 PM
About 19-20 mostly highway, 22 on the Interstate. 2005 STS Northstar RWD

Benjamin Simon
09-26-07, 11:36 PM
I have the 1SG V8 RWD with the 3.42 gears

I get while cruising with Air Cond:
26.5 mpg @ 45mph
26 mpg @ 50mph
24.5 mpg @ 60mph
22.5 @ 70mph
21 mpg @ 80mph
20.3 mpg @ 90mph

Add maybe .2 to .4 with Air Cond off.

With driving around town, there really too many variables. I average 20mpg but I don't hit many stop lights on the roads I go.

From my understand, they no longer offer the 3.42 gears in 2007 or 2008. Everyone should have 3.23s.

07 also has the 6 speed tranny, so highway mpg should improve in 2007+

rb92gt
09-27-07, 08:57 AM
By the way, I actually get about 0.5-1mpg less than what the computer calculates for me. I have tested several tank fulls of fuel, regular/premium didn't make a difference. I have a 2006 STS V8 RWD (2.73 gears) and get 17mpg city only, 20mpg mixed (70% highway), and 23 on the highway. Can get the claimed 26 highway if I drive the speed limit. I really think this car has the ability to get great gas mileage, just so much fun to have a heavy right foot which really hurts gas mileage.

dkozloski
09-27-07, 12:07 PM
Seeing fuel economy and STS V8 in the same sentence is hilarious.

shudog
09-27-07, 12:17 PM
Lots of info on this topic, try searching "mileage" in the STS forum.

It seems there are so many variables, but the car can get low 20 mpg but it drops quickly if you have a heavy foot.

I did read an interesting post about a guy who fashioned a home made cold air intake and claimed 2-3 mpg improvement...

Skibanker
09-27-07, 01:12 PM
I get about a half mile to one mile less than the computer says too, RB. Annoying, isn't it? Anyone know if there's an adjustment the dealer can make for that?

Curious George
09-27-07, 03:27 PM
I have the 1SG V8 RWD with the 3.42 gears

I get while cruising with Air Cond:
26.5 mpg @ 45mph
26 mpg @ 50mph
24.5 mpg @ 60mph
22.5 @ 70mph
21 mpg @ 80mph
20.3 mpg @ 90mph

Add maybe .2 to .4 with Air Cond off.

With driving around town, there really too many variables. I average 20mpg but I don't hit many stop lights on the roads I go.

These highway mileage results are very close to mine ('06 1SG with the 3.42 axle). Around town I get 12-13 MPG (lotsa stop-and-go, lotsa lead in the ole right shoe). The only way to consistently achieve EPA mileage is to drive down hill.

Lifer
09-27-07, 03:37 PM
I get about a half mile to one mile less than the computer says too, RB. Annoying, isn't it? Anyone know if there's an adjustment the dealer can make for that?

It is interesting that GM has the foresight to include computer readouts for the driver, and very few are accurate or can be calibrated. Miles until empty, gallons used, instant gas mileage, average gas mileage, and others. My firsat experience was for this was my '69 Olds Toranado and even the digital RPMs were off. However, in all fainess, my four Lincolns have all been wrong ,too. it seems that the designers want us to feel like we are in control, but in truth, we are being bamfoozelled so we will enjoy forking over the bucks for "high tech" gear. Even the Nav system shows the address of a house off by three houses away. But, on the otherhand, its fun to watch the numbers, false or true. :ill:

ijsegurola
09-27-07, 04:54 PM
WOW I must have a lead foot....

I have a 2006 V6 RWD and I get about 17.5 combined, about 80% city 20% hwy.......

Northstar52
09-30-07, 07:33 PM
I get around 14-15 mpg around town (in a rural area) and got 21.7 (65-70 mph) on a 600 mile trip to Wisconsin. 2005 STS AWD V8

porkfarm
10-01-07, 06:25 AM
If you are getting lots of brake dust on your rims, Your brakes could be dragging bringing your mpg down. I changed my pads, bleed the brakes, lubed the slides on the brakes and now my mileage is heading up. 23 MPG instead of 20 Avg. V8 RWD Rims stay nice and clean now also. I clean the slides twice a year when I change the tires over from snows.

corvette00
10-01-07, 01:32 PM
You guys must be driving down-hill. I consistently get 16.1 mpg around town with my 1SG awd v8. I put a K&N filter in this vehicle, without the filter it was actually 1mpg worse. The EPA (07 calc) is only 15mpg city. My 05 rwd v8 got 16.5 around town.

brewhaha9th
10-06-07, 05:09 PM
I have a 06 STS4 V8 and I get around 19.8 - 20.3mpg (80% hwy 20% city)

Heavy_Metal
10-06-07, 06:44 PM
I get around 14-15 mpg around town (in a rural area) and got 21.7 (65-70 mph) on a 600 mile trip to Wisconsin. 2005 STS AWD V8

I agree with this for my 2005 STS AWD.

PAULSTSMAN1
10-06-07, 07:17 PM
I have (2) STS's the older one gets 16.1 City, and 23.5 on the Highway with premium fuel. The newer one 2006 get 15.8 City and 23.0 Highway with 87 octane. Both of these economy rates are computer estimated. With the greater horsepower of the 2006 325 as opposed to 302 with the 1998, and the difference in Straightline Engine installation instead of traverse for the former this may also account for a difference in fuel mileage. The torque performance of the 2006 is awesome, while the front driver is luxury swoosh!:thumbsup:

Hope that helps!

Onalaska
10-06-07, 08:38 PM
2005 STS V8 computer consistently says it's getting 1-2 MPG better than it actually does. I figure it based upon miles driven and gas pump gallons every time I fill up. My 2006 Silverado computer is also very optimistic. The error on both is in the vehicle computer (or the flow meter device they use) and it shows the amount of fuel used is less than what the pump shows. At first I thought I was getting ripped by one particular gas station, but I don't buy gas at the same station so I know it's not the gas pumps. I think they just hope everyone will believe their figures, it helps sell more vehicles.

97C2S
10-08-07, 02:15 PM
Update, I decided to go with the V8. 2007 with 14K miles was purchased last Wednesday. We took a short road trip over the weekend and got great mileage, flat road, 75 MPH most of the time ending with 26.5 MPG. However, the on board computer was showing 23.3 MPG?? Well see what the next tank will give us, mostly city driving and Ill let everyone know the results.

porkfarm
10-08-07, 05:54 PM
Nice ! Congrats on your new ride !