hammeron

Something interesting about the Mustang GT to
Shelby GT conversion:

The starting Mustang GT gets 17 / 25 mpg
AfterShelby GT conversion it gets 16 /23 mpg ?

I can see the hood scoop causing a liitle drag, but what's
going on here........I thought the cai + tune helped mpg....

The ebay listing is here:
http://cgi.ebay.com/ebaymotors/Ford-...01222718QQrdZ1








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Orion_240

I think it has to do with the 3.55 gears.

blueherd02gt

BINGO!!!!

Rock36

It isn't the gears. The 2005 and 2006 GT 5 speeds came with the 3.55 gear stock, and we still got the 17/25 MPG without the gas guzzler tax.

2cokeman

It is new for 07, 3.55 gets the tax

Rock36

well good thing I bought mine in 2005 then

steamfish

No tax on my 07 w/3.55's.

Hey, btw... where does that thousand bucks end up anyway, is it just another tax or do they do something useful with it?

nick_svs

If I'm not mistaken, the Shelby (4.6 L) has a different exhaust than the standard GT. I would guess that this exhaust releases more emissions, so would justify the gas guzzler tax. As I understand it, it's essentially an emissions tax.

But, I could be talking out of my ***. That's just what made sense to me.

03Cobra05GT

Don't know if this has anything to do with it but I know the EPA Gas mileage ratings have all changed now for cars 2007 and up. They re-did the way they rate cars MPG. You can look it up on I think Edmunds even and see what your current car would get accroding to the new ratings. When I looked up the 2005 Mustang GT...our MPG went down to 16/23 I believe.

Rock36

That is interesting, I will have to look at how strict they are now.

I've got 4.10s, and nearly all the bolt-ons and I still can maintain 18.5 mpg on mixed city/highway driving in hilly terrain.I flog my engine and cook my tires daily too.