19 mpg - The 1947 - Present Chevrolet & GMC Truck Message Board Network

grs · 11-11-2011, 01:04 PM

I filled up at a station on the freeway. Then drove 35 miles. I then filled up again. I used 1.83 gal. of gas. I figured I was getting 19 MPG. The truck has a 305 engine with an overdrive trans.

stroker87 · 11-11-2011, 01:15 PM

Quote:

Originally Posted by grs

I figured I was getting 19 MPG.

I miss those days when I got 19mpg, now if I keep my foot out of it i get around 14mpg but i never do so it more like 11mpg lol

NCD1966 · 11-11-2011, 02:55 PM

my bone stock 84 has a th350 with 3.08 gear and i was getting 18 mpg going to crusin the coast this year. i still have the stock plug wires too!

grs · 11-11-2011, 03:12 PM

Quote:

Originally Posted by NCD1966

my bone stock 84 has a th350 with 3.08 gear and i was getting 18 mpg going to crusin the coast this year. i still have the stock plug wires too!

That is good for a 350.

Prerunner1982 · 11-11-2011, 03:39 PM

19 is really good. I got about 16mpg with my 87 GMC (305/700R4) Longbed 1/2 ton.

I would however suggest checking it over a couple tanks. You could have just had a tailwind on that 35 mile trip....

SCOTI · 11-11-2011, 05:54 PM

Quote:

Originally Posted by Prerunner1982

19 is really good. I got about 16mpg with my 87 GMC (305/700R4) Longbed 1/2 ton.

I would however suggest checking it over a couple tanks. You could have just had a tailwind on that 35 mile trip....

x2. One trip, one way, is not enough data to be exact. It could still be very close....

Stepper562 · 11-11-2011, 07:53 PM

Yeah on a 35 mile trip you can't really get the exact mpg...I'd do a 100 mile trip just for giggles and figure it out that way.

Still *****in' mpgs for a brick rolling down the road. I'm stoked when I see 14 on the freeway and maybe 11 on the street hehe. But then again I have a sticker on my truck which reads "Fu*k Hybrids" hahaha.
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NCD1966 · 11-11-2011, 08:09 PM

Quote:

Originally Posted by grs

That is good for a 350.

yeah I was getting 14.5 before. Then I changed the spark plugs and got 18 on the next trip

grs · 11-11-2011, 10:23 PM

Quote:

Originally Posted by Stepper562

Yeah on a 35 mile trip you can't really get the exact mpg...I'd do a 100 mile trip just for giggles and figure it out that way.

Still *****in' mpgs for a brick rolling down the road. I'm stoked when I see 14 on the freeway and maybe 11 on the street hehe. But then again I have a sticker on my truck which reads "Fu*k Hybrids" hahaha.
Posted via Mobile Device

If we sell our house I will drive it 900 miles to Texas. Then I will know what it gets. If it makes it to Texas that is.

thirdstreettito · 11-12-2011, 08:32 AM

ID be glad to see my 88 do more than 12. At least its constant, towing, flooring it, coasting it, always 12mpg.

1LowToy · 11-13-2011, 10:43 AM

GRS

Do you know what rear axle ratio you have?

My plans are a 700r4 behind the 250 I6, with 342 gears and see how tt turns out

As a side note: I've driven my dakota for too many miles. I've noted that the trans converter goes into lock-up mode at 55, any travel at less than that the fuel mileage goes down the Sh*ter. It seems to have a higher stall than necessary so I'm sure it's not helping.

grs · 11-13-2011, 10:47 AM

Quote:

Originally Posted by 1LowToy

GRS

Do you know what rear axle ratio you have?

My plans are a 700r4 behind the 250 I6, with 342 gears and see how tt turns out

As a side note: I've driven my dakota for too many miles. I've noted that the trans converter goes into lock-up mode at 55, any travel at less than that the fuel mileage goes down the Sh*ter. It seems to have a higher stall than necessary so I'm sure it's not helping.

Sorry but I don't know the rear axle ratio.

1LowToy · 11-13-2011, 01:02 PM

The ratio should be marked on the build sheet in the glovebox

grs · 11-13-2011, 02:23 PM

Quote:

Originally Posted by 1LowToy

The ratio should be marked on the build sheet in the glovebox

There are a lot of numbers in the glove box. I don't know what they all mean.

Prerunner1982 · 11-14-2011, 11:13 AM

Quote:

Originally Posted by 1LowToy

The ratio should be marked on the build sheet in the glovebox

If I remember correctly my 82 and 87 did not, they just has the code for Standard Ratio.... mine were 3.07 or 3.08 whichever GM uses.

11-11-2011, 01:04 PM	#1
grs Registered User Join Date: Jan 2010 Location: Roanoke, Tx. Posts: 1,561	19 mpg I filled up at a station on the freeway. Then drove 35 miles. I then filled up again. I used 1.83 gal. of gas. I figured I was getting 19 MPG. The truck has a 305 engine with an overdrive trans. Attached Images

11-11-2011, 02:55 PM	#3
NCD1966 Registered User Join Date: Jun 2010 Location: Lafayette , La Posts: 404	Re: 19 mpg my bone stock 84 has a th350 with 3.08 gear and i was getting 18 mpg going to crusin the coast this year. i still have the stock plug wires too! __________________ 1966 Chevy C10 Stepside 355ci sbc with 3speed OD 2021 GMC Sierra 1500 AT4 6.2 1980 Chevy Camaro z28 383ci 1990 Chevy Suburban 350 tbi 2x4 (sold) 1984 Chevy C10 sliverado short fleet 1997 Chevy C1500 short fleet

11-11-2011, 03:39 PM	#5
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	Re: 19 mpg 19 is really good. I got about 16mpg with my 87 GMC (305/700R4) Longbed 1/2 ton. I would however suggest checking it over a couple tanks. You could have just had a tailwind on that 35 mile trip.... __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

11-11-2011, 07:53 PM	#7
Stepper562 Registered User Join Date: Jun 2011 Location: Downey, ca Posts: 262	Re: 19 mpg Yeah on a 35 mile trip you can't really get the exact mpg...I'd do a 100 mile trip just for giggles and figure it out that way. Still ****in' mpgs for a brick rolling down the road. I'm stoked when I see 14 on the freeway and maybe 11 on the street hehe. But then again I have a sticker on my truck which reads "Fuk Hybrids" hahaha. Posted via Mobile Device

11-12-2011, 08:32 AM	#10
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	Re: 19 mpg ID be glad to see my 88 do more than 12. At least its constant, towing, flooring it, coasting it, always 12mpg. __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck

11-13-2011, 10:43 AM	#11
1LowToy Registered User Join Date: Nov 2009 Location: Sonora California Posts: 860	Re: 19 mpg GRS Do you know what rear axle ratio you have? My plans are a 700r4 behind the 250 I6, with 342 gears and see how tt turns out As a side note: I've driven my dakota for too many miles. I've noted that the trans converter goes into lock-up mode at 55, any travel at less than that the fuel mileage goes down the Sh*ter. It seems to have a higher stall than necessary so I'm sure it's not helping.

11-13-2011, 01:02 PM	#13
1LowToy Registered User Join Date: Nov 2009 Location: Sonora California Posts: 860	Re: 19 mpg The ratio should be marked on the build sheet in the glovebox



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