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leet sauce
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1,841 Posts
Discussion Starter #1
Hey guys, why dont we start an MPG thread?!?! A few people included myself have been interested in this subject for a while.
I think following form would help to get the thread organized correctly:

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


Here are mine :

Engine: 4.6L
City MPG: 15
Highway MPG: 19
Fuel Used: 89
Average highway cruise speed: 70MPH
Average Climate: Medium with alot of Rain
Mechanical Mods: Stock
Milage on the engine: 95,000Miles
Comments: New Fuelfilter helps
 

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91 Posts
I think you've posted on here about your gas milage before. I have virtually the same car as you, 97 4.6 stock engine. I put 3.73 gears in and removed the air silencer, that's it. I monitor and record all my records and I average about 23mpg and when I cruise anywhere on a roadtrip, I average anywhere from 28-30mpg. And I'm about 210km (145 miles) on that engine.

There has to be something up with your car to be only getting that kind of milage.
 

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Trumpeter Extraordinaire
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2,916 Posts
Engine: 4.6L
Overall MPG: 21 mpg
Fuel Used: Mobil, BP, or Citgo Premium
Average highway speed: 72MPH
Average Climate: SE Michigan
Mechanical Mods: Not many - Apten chip, J-mod, Richard M tube, PBR front brakes
Mileage on the engine: 505,225km (313,932mi)
Comments: Oil consumption is ~ 1qt/1000 miles. Stay on top of the maintenance!
 

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The Parts Guy
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7,269 Posts
Here are two of mine:


Engine: 94 4.6L DOHC V8
Avg. MPG (75% city/25% highway): 13.3 MPG Do I win the worst MPG contest?
Fuel Used: 93 Octane
Average highway speed: 80 MPH
Average Climate: Only driven during spring/summer/fall in Missouri
Mechanical Mods: WAY too much to list
Milage on the engine: 1,924 miles
Comments: It's hard to keep my foot out of the throttle :)

Engine: 00 Splitport 3.8L V6
Avg. MPG (50 city/50 highway): 22 MPG
Fuel Used: 87 octane
Average highway speed: 80 MPH
Average Climate: Driven year round in Missouri
Mechanical Mods: WAY too much to list
Milage on the engine: 65,000 miles

-Rod
 

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663 Posts
Engine:4.6
City MPG:22
Highway MPG:28
Fuel Used:93 oct
Average highway speed:60
Average Climate:humid southeast
Mechanical Mods:chip, stat, plugs, dynomax catback, K&N, no silencer
Milage on the engine:142,000
Comments:My work drive is 30 miles one-way, mixed city and hwy. I get around 22-23 MPG checked at every fill-up. I get 28+ on interstate trips.
 

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680 Posts
Engine: 4.6L
Overall MPG: 22 MPG
Fuel Used: 87 Octane
Average highway speed: 65-70 MPH
Average Climate: Year Round MN weather
Mechanical Mods: Stock
Milage on the engine: 135xxx
Comments: Mileage increased after I replaced my broken computer
 

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216 Posts
Engine: 4.6L
Overall MPG: 22 MPG
Fuel Used: 87 Octane
Average highway speed: 65-70 MPH
Average Climate: Year Round VA weather
Mechanical Mods: 96/97 intake/plenum
Milage on the engine: 117xxx
Comments: 3.27 gears, Jmod, Air silencer removed
 

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Eleventeenth Gear Poster
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3,067 Posts
Engine: 4.6L
Overall MPG: (25% city/75% highway): 20 MPG
Fuel Used: 93 Octane
Average highway speed: 70-80 MPH
Average Climate: HOT! Driven year round in South Florida
Mechanical Mods: Lots, but the major ones....Exploder motor, 3.73s, Marauder convertor, Apten Chip, catless true duals...
Milage on the engine: 83K on the motor, 154K on stock trans.
 

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1,286 Posts
Engine: 4.6 SOHC
City MPG: 19
Highway MPG: 24
Fuel Used: 89
Average highway speed: 70
Average Climate: Uhh... Missouri? 70s-80s average.
Mechanical Mods: Removed Silencer
Milage on the engine: 89,xxx
 

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Super Moderator
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11,961 Posts
Engine: 4.6 2V
City MPG: 14.5
Highway MPG: 26.8
Fuel Used: 93 octane Shell or Exxon-mobil
Average highway speed: 75mph
Average Climate: hotter than the sun
Mechanical Mods: Lots--See Signature below
Milage on the engine: 140k on engine/ 5k on heads
Comments: are those 6k RPM WOT 1-2's affecting my city MPG? :D
 

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43 Posts
Engine:4.6
City MPG:
Highway MPG: 17.6
Fuel Used: 87 octane any brand
Average highway speed: 72 mph(118km/h)
Average Climate: Northeast spring to fall (5-32celsius)
Mechanical Mods: stock
Milage on the engine: 103,000km (61,000mi)
Comments: Have never done city only driving. 90% hwy. Definitely some sort of problem somewhere that I am working on finding. I've almost given up on mileage and just floor it now and truth be told it seems to get better mileage!!
 

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398 Posts
Engine: 4.6L SOHC
City MPG: 20 MPG
Highway MPG: 26 MPG
Fuel Used: 87 octane (as cheap as I can find...usually at this no-name gas station (but they have the same color scheme as Exxon) that's always packed because they're always the lowest)
Average highway speed: 70-75 MPH
Average Climate: Doesn't seem to affect my car. But umm...hot in the summer, cold in the winter. lol
Mechanical Mods: U/D pulleys, removed air silencer, K&N panel filter (do these count?)
Milage on the engine: 119.5K
 

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252 Posts
Engine:4.6
City MPG:
Highway MPG:
Fuel: 87 Octane
Avg. Highway Speed: 70-80MPH
Average Climate: Mild to HOT
Mechanical Mods: Catless true duals, removed air silencer, K&N Cone Filter
Mileage:153,000
Comments: I get about 280 miles out of a tank of gas and I do a mix of city and highway driving and I'm not to light on the throttle
 

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Super Moderator
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16,774 Posts
Engine: 4.6L Slayer Of Hideous Chevys:D
City MPG: 11.6
Highway MPG: 20.2
Fuel Used: 89 bp or shell
Average highway speed: 80
Average Climate: 0-90
Mechanical Mods: cold air
Milage on the engine: 76,403
Comments: my foot is heavy;)
 

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Super Moderator
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10,330 Posts
I have 2 Cougars, 1996:


Black:

Engine: 4.6l
City MPG: No city driving (1%)
Highway MPG: 26.2 long term avg. (99-now)
Fuel Used: Exxon (Tiger Oil) 93 octane
Average highway speed: 80+
Average Climate: ~50F
Mechanical Mods: Silencer removed
Milage on the engine: 117k (Owned since 30k)
Comments: Inherited this car, totalled it about two years ago; have almost completely restored it (body damage). Drives great.
3.27 locker
Ceramic pads
BFG 225/70H15



Red:

Engine: 4.6l
City MPG: No city driving (1%)
Highway MPG: 21.2 long term avg. (03-now)
Fuel Used: Exxon (Tiger Oil) 93 octane
Average highway speed: 80+
Average Climate: ~50F
Mechanical Mods: Silencer removed
Milage on the engine: 193k (Owned since 130k)
Comments: Bought this car after totalling the black one; at 130k for $3k; immaculate inside; didn't come with ashtrays (strange)
Non locker rear diff, now 3.08; most of data with 3.27 NL
semimetallic pads
BFG 225/70H15 Stock Wheels

Castrol Syntec in both, 5W30. Changed at 3k. Yeah, thats about once a month...

I can't find any reason for the mileage difference; the two cars have been consistent except for problems, which were almost always shown in the mileage first.

I have replaced all the o2 sensors on both cars over time, if the rear ones short they somehow cause problems with the front ones.

I change plugs and wires every two years; transmission fluid as well.

I drive 48 miles one way, five days a week, more if I drive to lunch. Average ~500/wk

I tend to test my speed limiters regularly...
 

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Engine: 4.6L SOHC
City MPG: unknown
Highway MPG: unknown
Fuel Used: 87 octane at moment
Average highway speed: depends on the day, usually 75
Average Climate: Midwest...
Mechanical Mods: See Sig
Milage on the engine: 55K
Comments: Since adding the stock comp and putting the 2.73's in the car....WOW..all I can do is average the mileage per tank(Odometer STILL isn't working) based on round trips to work....67 mile round trip, average 5 round trips per week and misc driving after work. I would guess that I am averaging about 400-425 miles per tank of gas. That's about 25 mpg average.....city and freeway
 

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97 xr7
4.6 auto
regular gas
15 city
21 hwy
174000 miles
average speed is high (son has 2 tickets to his name so far 101 mph is a 55 and 57 in a 35)
climate mostly hot s.w. florida
 

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3,183 Posts
Engine: 4.6 w/ pi crap
City MPG: 7-8mpg
Highway MPG: 10-11mpg
Fuel Used: 93/94
Average highway speed: 70mph
Average Climate: 55-95
Mechanical Mods: headswap, cams, tc, gears
Milage on the engine: 66k
Comments: car runs like crap and never shifted right :)
 
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