Gas mileage - whachoo get? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cochran63 · 10-11-2005, 07:58 PM

My 63 with a 11.4:1 mrelin "grumpy jenkin" headed 427 with a 1050 dominater and 3.70 gears gets almost 4 mpg with mixed gas...

gchemist · 10-11-2005, 08:30 PM

16 MPG with 305/700r4 3.08 gears running 255/60R15 tires.

86swb · 10-11-2005, 08:46 PM

Quote:

Originally Posted by gchemist

16 MPG with 305/700r4 3.08 gears running 255/60R15 tires.

Looks like I need to change over to one of them 700r4 transmissions and , 3:08 gears but already have the 255/60R15 tires. 16MPG? That is good.

gchemist · 10-12-2005, 01:46 AM

16 MPG crusing 70 MPH!!! I get 13.? in the city. In the city I drive in 3rd. The torque converter locks at 1800 RPMs or ~45 MPH. A locking torque converter for city driving from 40-55 MPH is a key element. There are a lot of other factors too. Vinyl bed cover, aluminum wheels, aluminum radiator, electric fans, aero dynamics (yea right), good engine tune, maintenance.......it takes a lot of parts working together. OHHH and a light foot.

86swb · 10-12-2005, 07:10 AM

Also a good slick wax job.

MrC1 · 10-12-2005, 10:44 AM

Quote:

Originally Posted by 86swb

Does changing over to a 700R4 help much. Also changing to say a 3:08 gears? I am thinking about doing something to help boost up the mileage on the "86.

The 3.08s will help ONLY on the highway and will actually hurt the MPG in town. An OD tranny paired with decent gears will give you the best of both worlds.

86swb · 10-12-2005, 01:39 PM

Why would the 3:08 gears hurt you in the city? Do not understand.

Brainchild · 10-12-2005, 03:17 PM

Haven't checked my mileage.It's not good though.350,flat tops,and a 4 speed and a size 16 on the pedal,can't be good

cliffsta · 10-12-2005, 04:13 PM

10-12 city, 12-15 highway.

eric67m · 10-13-2005, 09:52 AM

Quote:

Originally Posted by 86swb

Also a good slick wax job.

Will this "slick wax" smooth out the surface rust on my truck? Maybe that would help.

rgray71 · 10-13-2005, 06:50 PM

My 71 GMC with 350/350 3:73 bored .30 over and 650 edelbrock 10 mpg.
85 Monte Carlo SS H.O. 305/200r4 3:08 out back i think? all stock 67k and I get 20 city & 24 hwy
My wifes weeny wagon (87 plymouth colt) 4 cyl auto 32mpg no matter where she goes.

GM72K10 · 10-13-2005, 06:55 PM

72 K10, 350 Auto, stock 15" L235R75 Tires, 3:08 rears - 12MPG
My everyday driver, 2004 K3500,6.0L Auto w/ stock 16" tires gets only 8 1/2 MPG! thank God for two tanks!

shortymac83 · 10-13-2005, 07:12 PM

the one time I actually checked was 8ish mpg with the 67

the delta averages 17-19 mpg combined

the grand prix averages 25 mpg

**68 Stepside** · 10-13-2005, 07:58 PM

When I drove the 68 every day, I averaged a piss-poor 6 MPG. Was running a worn out 350/TH350/3.73's, with 255/60/R15's out back.

Daily driver now gets me 17 or so on the highway, possibly a tad more than that on a really long trip. In town, I don't wanna know.

3 on the tree · 10-13-2005, 09:57 PM

70K5, 250/3 speed. 3.73 gears, 17mpg hiway w/top off
84 Cherokee w/3.4 TF auto, 3.73 gears, 22 hiway
81 E350 Ambulance (DD) 460/C6, 4.10 posi, driving weight 10,100 lbs 8mpg Hiway

chevjayfsd · 10-14-2005, 01:54 AM

My Garage Queen 72 gets average 9 mpg

My Daily Driver Monster Dodge gets 8 avg

88scottsdale · 10-14-2005, 02:07 AM

My 84 1 ton cc dually ,with a 427 bored.30 and eldbrock 650, turbo 400 tranny, and 373 gears ==== a consent 10 mpg.

MACO · 10-14-2005, 02:34 AM

10 mpg with my 71 C20 350 engine stock and tired except for hei and a Edelbrock carb
started at 4 mpg when I bought it but it ran like crap.

mike505 · 10-14-2005, 03:46 AM

84 C30 CC Dually. 454/TH400, 4.10 rear, 235/85/16 tires. All stock except for dual exhaust(nothing fancy). 8.7 mpg empty. Don't want to know with a trailer.

This is my daily driver. On the bright side though.....it's paid for.

rollinlow · 10-14-2005, 11:06 AM

my 2000 blazer gets about 18-20
my 88 berreta gets 32
my 96 s10 gets about 5 gallons a year lol

Jason915 · 10-14-2005, 11:29 AM

11.5 in town unloaded 11 towing 12 on the Hwy empty I need an overdrive

10-11-2005, 07:58 PM	#26
cochran63 Registered User Join Date: Jan 2004 Location: Oklahoma Posts: 1,057	My 63 with a 11.4:1 mrelin "grumpy jenkin" headed 427 with a 1050 dominater and 3.70 gears gets almost 4 mpg with mixed gas... __________________ Youth soon passes away, but immaturity can last a life time.

10-12-2005, 01:46 AM	#29
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	16 MPG crusing 70 MPH!!! I get 13.? in the city. In the city I drive in 3rd. The torque converter locks at 1800 RPMs or ~45 MPH. A locking torque converter for city driving from 40-55 MPH is a key element. There are a lot of other factors too. Vinyl bed cover, aluminum wheels, aluminum radiator, electric fans, aero dynamics (yea right), good engine tune, maintenance.......it takes a lot of parts working together. OHHH and a light foot. Last edited by gchemist; 10-12-2005 at 01:59 AM.

10-12-2005, 07:10 AM	#30
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	Also a good slick wax job. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

10-12-2005, 01:39 PM	#32
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	Why would the 3:08 gears hurt you in the city? Do not understand. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

10-12-2005, 03:17 PM	#33
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	Haven't checked my mileage.It's not good though.350,flat tops,and a 4 speed and a size 16 on the pedal,can't be good __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

10-11-2005, 08:30 PM	#27
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	16 MPG with 305/700r4 3.08 gears running 255/60R15 tires.

10-12-2005, 04:13 PM	#34
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	10-12 city, 12-15 highway. __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

10-13-2005, 06:50 PM	#36
rgray71 Registered User Join Date: Jan 2005 Location: Tonganoxie, Ks Posts: 180	My 71 GMC with 350/350 3:73 bored .30 over and 650 edelbrock 10 mpg. 85 Monte Carlo SS H.O. 305/200r4 3:08 out back i think? all stock 67k and I get 20 city & 24 hwy My wifes weeny wagon (87 plymouth colt) 4 cyl auto 32mpg no matter where she goes.

10-13-2005, 06:55 PM	#37
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,479	72 K10, 350 Auto, stock 15" L235R75 Tires, 3:08 rears - 12MPG My everyday driver, 2004 K3500,6.0L Auto w/ stock 16" tires gets only 8 1/2 MPG! thank God for two tanks! __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

10-13-2005, 07:12 PM	#38
shortymac83 hmm... Join Date: Jan 2004 Location: Culver, Indiana Posts: 1,631	the one time I actually checked was 8ish mpg with the 67 the delta averages 17-19 mpg combined the grand prix averages 25 mpg __________________ 1983 Oldsmobile Delta 88 1967 Chevy C-10 stripper www.fcrperformance.com - wanna go...faster? talk to FCR.

10-13-2005, 07:58 PM	#39
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	When I drove the 68 every day, I averaged a piss-poor 6 MPG. Was running a worn out 350/TH350/3.73's, with 255/60/R15's out back. Daily driver now gets me 17 or so on the highway, possibly a tad more than that on a really long trip. In town, I don't wanna know. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

10-13-2005, 09:57 PM	#40
3 on the tree Registered User Join Date: Oct 2004 Posts: 393	70K5, 250/3 speed. 3.73 gears, 17mpg hiway w/top off 84 Cherokee w/3.4 TF auto, 3.73 gears, 22 hiway 81 E350 Ambulance (DD) 460/C6, 4.10 posi, driving weight 10,100 lbs 8mpg Hiway

10-14-2005, 01:54 AM	#41
chevjayfsd Project 7dos Join Date: Aug 2001 Location: Abilene, Texas Posts: 876	My Garage Queen 72 gets average 9 mpg My Daily Driver Monster Dodge gets 8 avg __________________ 7DOS - 1972 C-10 350/350 Porterbuilt/Accuair 20x8.5/20x10 Ride Low or Die PSSST - Yes it's bagged. 7dos build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=610290

10-14-2005, 02:07 AM	#42
88scottsdale Registered User Join Date: Feb 2005 Location: HALIFAX NS Posts: 25	My 84 1 ton cc dually ,with a 427 bored.30 and eldbrock 650, turbo 400 tranny, and 373 gears ==== a consent 10 mpg.

10-14-2005, 02:34 AM	#43
MACO Registered User Join Date: Sep 2005 Location: British Columbia CANADA Posts: 118	10 mpg with my 71 C20 350 engine stock and tired except for hei and a Edelbrock carb started at 4 mpg when I bought it but it ran like crap. __________________ 1969 C20 Customer Camper CST, 396, TH400, Factory A/C, Olive Green. Last edited by MACO; 10-14-2005 at 02:35 AM.



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10-14-2005, 03:46 AM	#44
mike505 Registered User Join Date: Feb 2004 Location: Old Town, FL Posts: 22	84 C30 CC Dually. 454/TH400, 4.10 rear, 235/85/16 tires. All stock except for dual exhaust(nothing fancy). 8.7 mpg empty. Don't want to know with a trailer. This is my daily driver. On the bright side though.....it's paid for.

10-14-2005, 11:06 AM	#45
rollinlow Registered User Join Date: Sep 2005 Location: tn Posts: 206	my 2000 blazer gets about 18-20 my 88 berreta gets 32 my 96 s10 gets about 5 gallons a year lol

10-14-2005, 11:29 AM	#46
Jason915 Registered User Join Date: Jan 2005 Location: Colorado Springs Posts: 693	11.5 in town unloaded 11 towing 12 on the Hwy empty I need an overdrive __________________ 1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder

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