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Discussion Starter #1 (Edited)
4.6/5.0 has a mpg thread, well i would like to know what other 3.8/4.2 owners are averaging. here's a form to get this thing going. (sorry to jack the thread from the v8 guys, but i wanna know v6 averages.)

Engine:
City MPG:
Highway MPG:
Fuel Used:
Average highway speed:
Average Climate:
Mechanical Mods:
Mileage on the Engine:
Comments:

here's mine........
Engine: 3.8
City MPG: combined w/ highway
Highway MPG: combined w/ city 20.5 per gal.
Fuel Used: 91 oct.
Average highway speed: 75-80
Average Climate: 77 f
Mechanical Mods: CAI, autolite platinum plugs, bosch 8mm wires, new ign. control modual, true dual exaust,and new fuel filter.
Milage on the engine: about 81,000
Comments: this sucks but seems better than the 13-15 mpg i was getting. i can't really do city mpg seperate from highway mpg because i do both constantly. my dual exaust is also killing my gas mileage because i went the cheap route and got glasspacks, next tax income check i'm going for two magnaflow mufflers so that should help out. but i have noticed a good difference in mileage since i started using 91 oct. instead of 89 oct.
 

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Street Freekz
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754 Posts
Engine: 3.8L
City MPG: combined w/ highway
Highway MPG: Varies from 19-22
Fuel Used: 87
Average highway speed: 55-65
Average city speed: 35-40
Average Climate: 15*F-95*F
Mechanical Mods: New Motorcraft plugs & wires.
Mileage on the engine: 108,000 (original engine & tranny)

Comments: I constantly drive in both city and highway conditions so I can't really figure up city MPG. Hopefully, when I get Flowmater's dual exhaust system it will improve my gas mileage a little.

P.S. 'mybird 91': I added 'average city speed' to the list also.
 

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Discussion Starter #3
thanks for the input and extra info 96 cougar......if anybody has additional info they wanna add please do so, it is appreciated.
 

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Street Freekz
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mybird_91 said:
thanks for the input and extra info 96 cougar......if anybody has additional info they wanna add please do so, it is appreciated.

Welcome & glad to help out. Its nice to see someone start a gas mileage thread for the V6's.
 

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Who is John Galt?
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Engine: 3.8L
City MPG: 18-20
Highway MPG: 27-30
Fuel Used: 87, preferrably Shell gasoline
Average highway speed: 65-75mph
Average Climate: It's Indiana, there is no average climate.
Mechanical Mods: K&N FIPK & Lexan Heatshield, ASP U/D Pullies
Comments: No O/D used in city, 3.27 rear gears
 

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Discussion Starter #6
cougar_guy04 said:
Engine: 3.8L
City MPG: 18-20
Highway MPG: 27-30
Fuel Used: 87, preferrably Shell gasoline
Average highway speed: 65-75mph
Average Climate: It's Indiana, there is no average climate.
Mechanical Mods: K&N FIPK & Lexan Heatshield, ASP U/D Pullies
Comments: No O/D used in city, 3.27 rear gears
thats funny, my gf works at a shell service/fuel station.....their gas is usually 3-4 cents higher so i go for qt gas because its always 1-2 cents cheaper than everywhere else in town......thanks for the input
 

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Who is John Galt?
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I just fuel up at shell because there's one right besides campus. There's a Thornton's down by I-70, but I honestly think I get better mileage with the shell gasoline over Thronton's or Pilot gasoline.

Plus, it's a 5 mile (or more) round trip to fill up. I'll burn the difference in gas going to and from the gas station.
 

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Discussion Starter #8
makes sense........like i used to fill up in missouri because it was 10cents cheaper.....but i was getting smokes there too so it served purpous......now i get between 3-6 dollar off cartons and gas has been pretty much the same price so i might as well stay here and get it.
 

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RWD is for Men!!
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236 Posts
Engine:
City MPG: 17
Highway MPG: no real highway driving around here
Fuel Used: 87 Mobil
Average highway speed: probably 40 if I accounted all of the sitting time
Average Climate: 75
Mechanical Mods: removed air silencer, K&N
Mileage on the Engine: 106k
Comments: Never get an open stretch of highway to really cruise
 

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Engine: 3.8L
City MPG: 16-18
Highway MPG: on highway only-29 mpg
Fuel Used: 87 generally HESS
Average highway speed: 75-80
Average city speed: 35-45
Average Climate: outside Philly, who knows
Mechanical Mods: new plugs, wires and fuel filter w/ cone filter in engine bay
Mileage on the engine: 107,000 (original engine & tranny)

Comments: Highway milage was going up to the mountains, generally uphill for 2 hours.
 

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The Parts Guy
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Engine: 2000 Splitport 3.8L NA

City MPG: 17-19

Highway MPG: 22-24

Fuel Used: Mainly 87 octane but I do flip the switch for the chip and run 93 octane from time to time

Average highway speed: 70 MPH

Average Climate: St. Louis, MO (all sorts of weather)

Mechanical Mods: Tons.....the main mods that apply here are the splitport engine, DIS ignition, 21 lb. fuel injectors, 3.73's, and the Diablo flip chip with a very safe A/F ratio.

Mileage on the Engine: 64,000

Comments: I didn't build the car with fuel mileage in mind, but the car does serve me well as my daily driver. It gets way better mileage than the XR7.

-Rod
 

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Engine:3.8 sc
City MPG:21
Highway MPG:29
Fuel Used:93 octane
Average highway speed:65
Average Climate:75-80 roughly
Mechanical Mods: 9" cone filter, 73mm MAF, 3" intake, 70mm TB, and 5% OD pully
Mileage on the Engine:83k
Comments: even at 85 mph, i get 25 mpg!
 

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I was about to start a thread just like this.

Engine:3.8
City MPG:?
Highway MPG:23
Fuel Used:87
Average highway speed:80
Average Climate:60-90
Mechanical Mods:n/a
Mileage on the Engine:86k
Comments:even at 110 mph I get 23
 

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Engine: 3.8L
Average MPG: 27 City/Hwy (Spilt up pretty evenly, and I ain't easy on the pedal)
Fuel Used: 87 lately 89 on occasion
Average Hwy speed: 80
Average City speed: 45
Climate: 80-95 and humid
Mods: None as of yet
Mileage: 142,500 (knock on wood)
 

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Discussion Starter #15
just realized shell where my gf works has 93 oct. i thought there was only 91 around here.

can this thread get stickied too???
 

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Street Freekz
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mybird_91 said:
can this thread get stickied too???
I think it needs to be.....
 

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Discussion Starter #17
all in favor of sticky say I.............I!!!!!!!!!!!!
 

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Street Freekz
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mybird_91 said:
all in favor of sticky say I.............I!!!!!!!!!!!!

I, of course. The 3.8/4.2 guys need our own MPG thread.
 

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My car has gotten good mileage since new. I maintain it well and drive it semi-sane most of the time.



Engine: 3.8
City MPG: 20
Highway MPG: 28
Fuel Used: supreme 93 octane
Average highway speed: 85
Average Climate: Florida HOT
Mechanical Mods: k/n - chip - cooler plugs - Jmod - pully
Mileage on the Engine: 180,000
Comments: Stock except for listed items. I keep waiting for the alternator, water pump, a/c, master cylinder, tranny or something to go, but it keeps on running great.
 

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Engine: 3.8L
City MPG: 18mpg
Highway MPG: 24mpg
Fuel Used: 91 only
Average highway speed: 75mph
Average Climate: -40*f to +90*f
Mechanical Mods: 3.73's, PI converter, MMX driveshaft, Vortech Blower, ported heads, ported intakes, 42# injectors, very safe SCT tune (11.5:1 A/F WOT)
Mileage on the Engine:112,000
Comments: better mileage now then when it was stock.
 
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