got 20.5mpg...YAY!!!
#1
got 20.5mpg...YAY!!!
drove the car home from Atlanta dragway, which is about a 180mile drive. got stuck in alittle traffic for about 30mins and stopped through macon on the way home to hangout with some friends so there was alittle bit of on and off during that trip. i also "played" alittle when i was in traffic and in town. got 20.5mpg
so i decided that i'd do my best this week to get good mileage. normally i can go about 3.5-4 days between fillups, which is about 180miles. (this is around town and highway mixed). so far i've gone 150miles and am JUST under a 1/2 a tank. this car is NO slouch either, which is why i'm so pleased.
worked over 750 double pumper
holley street dominator intake
worked 113 casting aluminum vette heads
crane solid cam 238*/248*@.050 .480"/.500"
comp Pro-magnum 1.5 roller rockers
hedman longtubes and 2.5" true duals
10.2:1 c/r
700r4 w/ lockup, but has a 10" 4000stall ATI converter
3.73's with 275/60/15 m/t ET Street Radials.
just thought i'd share my findings. i hope that with the upcoming road trips i have planned that i can net close to 23-25mpg on the highway given i don't get caught in too much traffic and don't make too many stops.
so i decided that i'd do my best this week to get good mileage. normally i can go about 3.5-4 days between fillups, which is about 180miles. (this is around town and highway mixed). so far i've gone 150miles and am JUST under a 1/2 a tank. this car is NO slouch either, which is why i'm so pleased.
worked over 750 double pumper
holley street dominator intake
worked 113 casting aluminum vette heads
crane solid cam 238*/248*@.050 .480"/.500"
comp Pro-magnum 1.5 roller rockers
hedman longtubes and 2.5" true duals
10.2:1 c/r
700r4 w/ lockup, but has a 10" 4000stall ATI converter
3.73's with 275/60/15 m/t ET Street Radials.
just thought i'd share my findings. i hope that with the upcoming road trips i have planned that i can net close to 23-25mpg on the highway given i don't get caught in too much traffic and don't make too many stops.
#2
Supreme Member
iTrader: (1)
Join Date: Jul 2004
Location: Calgary, AB, Canada
Posts: 10,763
Likes: 0
Received 4 Likes
on
4 Posts
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
750cfm double pumper, solid cam, 3.73 gears and 20MPG? low 12sec ET, and low budget car.
So now you're setting mileage records to go with your incredible ets? Sooner or later you're going to get audited by the hotrod police
You should write a book.
So now you're setting mileage records to go with your incredible ets? Sooner or later you're going to get audited by the hotrod police
You should write a book.
#5
Supreme Member
iTrader: (2)
Join Date: Mar 2004
Location: Kissimmee, FL
Posts: 1,941
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Camaro RS
Engine: 357cid
Transmission: T5 Swap
Axle/Gears: 10bolt 7.5" 3.23 soon to be 3.73
Originally Posted by 88 Z28 Guy
Damn im hoping to get 18
#6
Senior Member
Join Date: Mar 2002
Location: Newport News, Va
Posts: 755
Likes: 0
Received 0 Likes
on
0 Posts
Car: 84 Z28
Engine: GMPP 350 HO
Transmission: 700R4 + Shift Kit
Axle/Gears: Auburn Posi; Richmond 3:73 Gears
I shouldn't comment here I get about 9mpg highway :-/ and i have lot smaller setup. I can get my carb setup right gerrrrr.
#7
ok, update*
i got to 180miles on the tank and rolled by a gas station that was $.25 cheaper than anywhere else in the area, so i had to fill up and check the mileage. 15.99mpg, this is mixed driving city and highway. i'd still like to go on another road trip to see what kind of straight highway mileage i get cause i know i'd get around 23mpg.
----------
this is definitely still the case though when i get into the secondary side of the carb when i really want to lay into it. i can feel the secondaries under my foot when i stomp on it and i watch the tach go up, and the gas go down.
i got to 180miles on the tank and rolled by a gas station that was $.25 cheaper than anywhere else in the area, so i had to fill up and check the mileage. 15.99mpg, this is mixed driving city and highway. i'd still like to go on another road trip to see what kind of straight highway mileage i get cause i know i'd get around 23mpg.
----------
Originally Posted by Saigon_Bob
and if i even think about getting on it.... the gas gauge drops like a stop watch
Last edited by mw66nova; 04-14-2006 at 02:27 AM. Reason: Automerged Doublepost
Trending Topics
#8
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 36 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Single-tank calculations are rarely accurate, especially when the mileage is short. On my roadtrip in February, I had fill-ups with 27 mpg and 13 mpg. For the entire 1000-mile trip, it came out to 22 mpg.
#10
Supreme Member
Join Date: Dec 2001
Location: boonton, NJ
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
Car: 84 camaro Z28
Engine: 434sbc
Transmission: powerglide
Axle/Gears: moser 9" with 411 posi
you all suck(jk)
i get 5 mpg around town. i never tryied highway driving. i would imagine somewhere around 7mpg
i get 5 mpg around town. i never tryied highway driving. i would imagine somewhere around 7mpg
#11
Moderator
Join Date: Jan 2000
Location: Mercedes Norte, Heredia, Costa Rica
Posts: 20,981
Likes: 0
Received 9 Likes
on
8 Posts
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
7 mpg is pretty bad.
There was a guy locally here who bought a 1970 big block Corvette and decided he was going to drive it cross country. He averaged about 9 mpg, and by the time he got back he'd paid more in fuel than he had for the car originally.
There was a guy locally here who bought a 1970 big block Corvette and decided he was going to drive it cross country. He averaged about 9 mpg, and by the time he got back he'd paid more in fuel than he had for the car originally.
#14
Supreme Member
That's really amazing, given your cam and gearing. I think the lockup converter is helping you tremendously, especially versus running a non-lockup 4000 stall unit!
Holleys can give good mileage, properly tuned and driven easy, but I doubt I could equal your results.
Holleys can give good mileage, properly tuned and driven easy, but I doubt I could equal your results.
#16
Supreme Member
iTrader: (2)
Join Date: Mar 2004
Location: Kissimmee, FL
Posts: 1,941
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Camaro RS
Engine: 357cid
Transmission: T5 Swap
Axle/Gears: 10bolt 7.5" 3.23 soon to be 3.73
Originally Posted by mw66nova
hmmm....i guess i just have the magical touch or something? lol!
all you need is time, patience, tools and parts( jets, air bleeds, etc ) and a $600 tuning software( wideband o2 and the such) lol and a laptop.... but it can be achieved
#17
Supreme Member
iTrader: (1)
Join Date: Jun 2001
Location: 600 yds out
Posts: 1,520
Likes: 0
Received 0 Likes
on
0 Posts
Car: Bee-Bowdy
Engine: blowd tree-fity
Transmission: sebin hunnerd
Axle/Gears: fo-tins
I'm so jealous. My bone stock LG4 and 2.73's don't get that.
And I think you're prolly 8 seconds faster than me in the 1/4
And I think you're prolly 8 seconds faster than me in the 1/4
#18
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,119
Received 428 Likes
on
368 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally Posted by V8Astro Captain
I'm so jealous. My bone stock LG4 and 2.73's don't get that.
And I think you're prolly 8 seconds faster than me in the 1/4
And I think you're prolly 8 seconds faster than me in the 1/4
BTW, mw66nova this shows that you have really spent the time to dial in your setup. Now if it only had EFI and you put the same effort into tuning it.
Last edited by Fast355; 04-15-2006 at 08:56 PM.
#20
Supreme Member
iTrader: (1)
Join Date: Nov 2003
Location: Davenport, Iowa
Posts: 1,598
Likes: 0
Received 2 Likes
on
2 Posts
Car: Still a 3rd Gen
Engine: 450HP 355
Transmission: TH350
Axle/Gears: 9" with 4.11's
wow.. i burnt 1/8 of a tank in 15 minutes on the highway today doing the speed limit. i'm guessing between 6 and 8 MPG... first time the car has been out since July tho... I'm thinking i need to tune the carb a bit better.. lol
#21
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,119
Received 428 Likes
on
368 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally Posted by Purple82TA
wow.. i burnt 1/8 of a tank in 15 minutes on the highway today doing the speed limit. i'm guessing between 6 and 8 MPG... first time the car has been out since July tho... I'm thinking i need to tune the carb a bit better.. lol
#22
Supreme Member
iTrader: (4)
Join Date: Jan 2005
Location: Long Island, New York
Posts: 1,048
Likes: 0
Received 1 Like
on
1 Post
Car: 1988 Firebird Formula
Engine: 388 Carb
Transmission: 700R4
Axle/Gears: 4.10
yea it sucks having to fill it up after a long night, i dont have a working speedo or odometer but i cant imagine me getting double digits in gas... i also drive "more fun" when there is noone around on the roads...
#23
On Probation
Join Date: Nov 2005
Posts: 774
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2002 Formula
Engine: 5.7 LS1
I just put on a new carb, the old one wasnt working right. The car is quick, but man gas miliage sucks. I went across town and dumped a quarter of a tank. At $3.00 a gallon thats not good. I just heard gas hit a record 70. a barrel, so fill up. By the end of april $3.00 will look good.
#24
Supreme Member
iTrader: (4)
Join Date: Jan 2005
Location: Long Island, New York
Posts: 1,048
Likes: 0
Received 1 Like
on
1 Post
Car: 1988 Firebird Formula
Engine: 388 Carb
Transmission: 700R4
Axle/Gears: 4.10
Originally Posted by rideon1200
I just put on a new carb, the old one wasnt working right. The car is quick, but man gas miliage sucks. I went across town and dumped a quarter of a tank. At $3.00 a gallon thats not good. I just heard gas hit a record 70. a barrel, so fill up. By the end of april $3.00 will look good.
#25
Supreme Member
Join Date: Jul 2003
Location: Pensacola, FL
Posts: 1,104
Likes: 0
Received 1 Like
on
1 Post
Car: 1999 Saturn SL2
Engine: 4 cylinder
Transmission: 4-speed automatic
Last time I did the calculations for my gas milage, I ended up with 12mpg doing all city driving. I drive like a granny most of the time. My only mods are the addition of Hooker 2055s, a Catco high flow cat and Hooker catback.
I think the EPA average for LG4s in 1985 was something like 15-17 mpg. I think I'm losing 3 to 4 mpg just because my carb is way out of whack. I've fixed just about everything I could think of that would cause bad milage, but the carb has been untouched since I bought the car (and I know the previous owner fiddled with it a lot, in an effort to keep it idling). Does is sound feasible that I am losing that much just because the carb is old and untuned?
I think the EPA average for LG4s in 1985 was something like 15-17 mpg. I think I'm losing 3 to 4 mpg just because my carb is way out of whack. I've fixed just about everything I could think of that would cause bad milage, but the carb has been untouched since I bought the car (and I know the previous owner fiddled with it a lot, in an effort to keep it idling). Does is sound feasible that I am losing that much just because the carb is old and untuned?