# GM cancels new DOHC V8 plans
**URL:** https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171
**Category:** NYSpeed Automotive
**Created:** [January 3, 2008, 2:28pm UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171 "2008-01-03T14:28:08Z")
**Posts on this page:** 13
**Page:** 3
### Author:  [@camarojoe](https://forums.speedlife.net/u/camarojoe)
#### Post date: [January 17, 2008, 7:40am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/41 "2008-01-17T07:40:08Z")
Isn’t this the same engine that they were going to do at the Tonawanda Plant?
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### Author:  [@snowracer101](https://forums.speedlife.net/u/snowracer101)
#### Post date: [January 17, 2008, 7:46am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/42 "2008-01-17T07:46:19Z")
i get worse mpg in my 4 cly than mosts peoples v6’s and v8’s
I average 18 around town in the wrx.
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### Author:  [@Fry](https://forums.speedlife.net/u/Fry)
#### Post date: [January 17, 2008, 7:48am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/43 "2008-01-17T07:48:14Z")
I get ~18 in my 6 cylinder.
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### Author:  [@Dr.Stevil](https://forums.speedlife.net/u/Dr.Stevil)
#### Post date: [January 17, 2008, 7:55am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/44 "2008-01-17T07:55:50Z")
get around 20-22mpg in my ls1 powered GTO
edit: my old 93 lincoln, which had a DOHC 4.6L and got 29mpg on the highway
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### Author:  [@JayS](https://forums.speedlife.net/u/JayS)
#### Post date: [January 17, 2008, 7:58am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/45 "2008-01-17T07:58:36Z")
> [@Fry](#):
>
> I get ~18 in my 6 cylinder.
Kind of pointless to compare the V8 in my Expedition to the V6 in your Xterra though.
What I was talking is what GM is going to do, basically putting your V6 in my Expedition. To get that vehicle moving you’re going to need to work that motor a lot more, resulting in even worse gas mileage than the V8 that you barely need to touch to merge with traffic.
This becomes even more true when you’re comparing a relatively weak V6 that only makes decent power when turbocharged. Sure, as long as you stay out of boost the mileage should be ok. And you can bet GM et al will tune those motors to stay out of boost on that EPA test cycle. But out in the real world to pull out in traffic and merge my guess is you’re going to be getting into the boost, and your real mileage will not match that little EPA sticker.
Time will tell. Certainly doesn’t look good for enthusiast drivers right now.
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### Author:  [@ubengineering](https://forums.speedlife.net/u/ubengineering)
#### Post date: [January 17, 2008, 8:01am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/46 "2008-01-17T08:01:56Z")
> [@93z24](#):
>
> i normally get 26-28mpg on my V6.
dayum, when cobalts come into my shop, typically around 15 a day, all of their average fuel economy is around 21 mpg
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### Author:  [@Blue\_Eyed\_Devil](https://forums.speedlife.net/u/Blue_Eyed_Devil)
#### Post date: [January 17, 2008, 8:11am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/47 "2008-01-17T08:11:26Z")
I get 22mpg in my 2 turbo V6 with almost 300hp.
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### Author:  [@BigRon](https://forums.speedlife.net/u/BigRon)
#### Post date: [January 17, 2008, 8:16am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/48 "2008-01-17T08:16:03Z")
Isn’t this the same thing but with someone else talking about it:
[http://nyspeed.com/forums/showthread.php?t=43069&highlight=GM+V8](http://nyspeed.com/forums/showthread.php?t=43069&highlight=GM+V8)
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### Author:  [@Fry](https://forums.speedlife.net/u/Fry)
#### Post date: [January 17, 2008, 9:42am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/49 "2008-01-17T09:42:57Z")
Whoops! Thread merge coming…
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### Author:  [@somedude](https://forums.speedlife.net/u/somedude)
#### Post date: [January 17, 2008, 5:09pm UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/50 "2008-01-17T17:09:41Z")
> [@JayS](#):
>
> Kind of pointless to compare the V8 in my Expedition to the V6 in your Xterra though.
>
> What I was talking is what GM is going to do, basically putting your V6 in my Expedition. To get that vehicle moving you’re going to need to work that motor a lot more, resulting in even worse gas mileage than the V8 that you barely need to touch to merge with traffic.
>
> This becomes even more true when you’re comparing a relatively weak V6 that only makes decent power when turbocharged. Sure, as long as you stay out of boost the mileage should be ok. And you can bet GM et al will tune those motors to stay out of boost on that EPA test cycle. But out in the real world to pull out in traffic and merge my guess is you’re going to be getting into the boost, and your real mileage will not match that little EPA sticker.
>
> Time will tell. **Certainly doesn’t look good for enthusiast drivers right** now.
ford’s new ecoboost 3.5 V6 engine shows great promise. 340hp 340tq
it will start life in the lincoln MKS then in late 09 it will be in the taurus sport modle (actual name unknown). It is a twin turbo powerplant and soposedly has little to no turbo lag. who knows what the aftermarket will look like but based on how the mazdaspeed is taking to mods I would guess not so well compared to inteligent car companies that like enthusiest.
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### Author:  [@misteroman](https://forums.speedlife.net/u/misteroman)
#### Post date: [January 17, 2008, 5:19pm UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/51 "2008-01-17T17:19:34Z")
> [@camarojoe](#):
>
> Isn’t this the same engine that they were going to do at the Tonawanda Plant?
yes sir.
D
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### Author:  [@Dr.Stevil](https://forums.speedlife.net/u/Dr.Stevil)
#### Post date: [January 17, 2008, 5:21pm UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/52 "2008-01-17T17:21:01Z")
> [@somedude](#):
>
> ford’s new ecoboost 3.5 V6 engine shows great promise. 340hp 340tq
> it will start life in the lincoln MKS then in late 09 it will be in the taurus sport modle (actual name unknown). It is a twin turbo powerplant and soposedly has little to no turbo lag. who knows what the aftermarket will look like but based on how the mazdaspeed is taking to mods I would guess not so well compared to inteligent car companies that like enthusiest.
heh, no shit. Haven’t heard about this until now
I’d be damn impressed if Ford went through with it
edit: appears that the engine output running on e85 is around 400hp
not bad… maybe this isn’t the end of the modern hotrods
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### Author:  [@BrockwayMT](https://forums.speedlife.net/u/BrockwayMT)
#### Post date: [January 18, 2008, 9:42am UTC](https://forums.speedlife.net/t/gm-cancels-new-dohc-v8-plans/41171/53 "2008-01-18T09:42:55Z")
> [@FuzzyFish](#):
>
> Don’t toss reality into this!
>
> They really do need to revise the EPA mileage rating system though.
No you people need to quit driving like idiots. Don’t accelerate too fast, don’t use too much brake, and don’t drive too fast, and you’ll be fine. Accelerate from 0 to 45 in 4 seconds to stop at the next light 200 yards later and go 75 on the highway and of course you’ll do much worse than the EPA rating.
My truck is rated 15/19 and I get 17 on average city/highway mixed. Winter gas takes that down to 16. At 62.5 mph I get over 18mpg on highway with winter gas. With summer gas and at 55 mph I’m sure I could get the 19 mpg (older EPA ratings were 55 mph).
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