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k5 MPG?

Idk I need to actually do specific math but 350 TBI, 1.6 rockers, mild cam, full exhaust, and a K&N pushing a sm465/208 36in radial tsl's with 3.73 gears and I'm around 12-15 city. I think I estimate myself a little high but I feel like I have the perfect amount of power for the truck. Plus its only got a 4in lift on it.

I'm hoping for 25 city with the 4bt if I can ever make that happen :D

The diesel does make up for itself btw just have to drive it right. Well idk about a 6.2 but a 3.9 cummins is worth the $4 a gallon.
 
If you're looking for anything for mileage you're looking at a wrong breed of rig IMO. As you probably already know. I got around 13mpg in my blazer with 33's and 3:73 gears with a 350 turbo. I never took it easy on that old tranny. I now have a 465 tranny with 35's and MAYBE get 11mpg.

I would never say the TBI motors get any more gas mileage cause my brothers 92 chevy is a GAS HOG!! i mean i'd take my blazer over it anyday
 
in the summer i get just under 12 around town with a heavy foot, and saw mid 15 on the highway before replacing the o2 sensor. it is a suburban, so the city mileage will be worse then a blazer.

350ci, 700r4, stock suspension height, 3.42s, 31s
 
tRustyK5 said:
I highly doubt it...freeway maybe but not in town.

Rene
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look at what a tahoe today gets with 20 years of advanced tech behind it.. or a expedition..they barly and sometimes don't touch those numbers.


I lke to look at the smiles per gallon and not the miles per gallon:D when I drive my buggy or my big white truck..its all about the smiles baby! when I drive the colorado..its all about the mpgs.


seriously though, if you dont like the gas and you drive more that 10 or 20 miles a day, a cheap 93 corola is really not a bad option, its old enough to where parts,ins and reg is cheap. They are super easy to work on and get good milage, and they dont even look that bad.
 
velojym said:
When I was a teen, I had an '87 Camaro with the 305 V8 and a 4-speed overdrive tranny.
A friend had a nearly identical Firebird with a v6, and IIRC, the same transmission. He got somewhere in the mid 20s on our convoy trips to Amarillo, and I usually got a solid 31 or so. He was always shocked, and tried
to keep it easy on the gas (as I already was).

Bottom line? Use enough engine, but not too much. My 305 wasn't about to win any races, but it didn't have to work hard at all.

...and, yeah. My math was good. Still is.
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the 550 hp 6 speed vette knocks own wonderfull numbers, my dad has a 98 formula with the 305 tpi and 5 speed, does great on the highway for gas!
 
I was thinking... with a bit of antimatter and the help of a 12 year old physics prodigy, I can work out some sort of warp field which will slip the air in front of my Blazer into subspace, to reappear right after I pass.
Heck, I figure, if we tweak it enough, we can actually keep a mild vacuum in front of the truck, bringing my mpg up to some unreal levels.

Sometime after, I'll figure out how to engineer an Infinite Improbability Drive... but I haven't found a cocktail party up to the standards needed to test the theories.
 
1987 v 10 350 700r4 3.42 gears 31" a/t's 13.5 (12 towing anything)

1987 v10 350 700r4 4.11 gears 33 mt's with 4" lift 12.5


same truck
 
Ben B. said:
anyone w/ old gas V8s in this thread saying they're getting high teens and low 20's [hiway or not] better rethink their math skills.

My sunfire w/ a 4 banger averages about 20mpg town/hiway mix.
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miles driven on tank/gallons of gas used=avg mpgs. not too difficult.

and i think you need to take that sunfire to a mechanic, my parents 97 sunfire we had for years averaged 35-40 on the freeway, 25-30 around town. somethings wrong if its that bad.
 
How many times can this subject possibly come up on this board?

70's-80's full size GM trucks suck fuel. The best you'll do is a stock-ish diesel with overdrive. End of story.
 
velojym said:
Sometime after, I'll figure out how to engineer an Infinite Improbability Drive... but I haven't found a cocktail party up to the standards needed to test the theories.
Click to expand...

I get that!

<--------:D
 
supersize75k5 said:
look at what a tahoe today gets with 20 years of advanced tech behind it.. or a expedition..they barly and sometimes don't touch those numbers.
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Dont forget that even thought they get better technology they also weigh in a little more than our trucks and end up weighing more after each generation.
 
velojym said:
When I was a teen, I had an '87 Camaro with the 305 V8 and a 4-speed overdrive tranny.
A friend had a nearly identical Firebird with a v6, and IIRC, the same transmission. He got somewhere in the mid 20s on our convoy trips to Amarillo, and I usually got a solid 31 or so. He was always shocked, and tried
to keep it easy on the gas (as I already was).

Bottom line? Use enough engine, but not too much. My 305 wasn't about to win any races, but it didn't have to work hard at all.

...and, yeah. My math was good. Still is.
Click to expand...


EH?!?!?!?! 31mpg from a third gen??? the best i ever got from my two 89 camaros was 26 mpg, from the IROC with a 5.7TPI/700R4 with 2.77 gears. although 23mpg was far more common. the RS with the 305TBI/700R4 with 2.73 gears usualy got around 21 or 22.

Although i am addmittedly heavy on the right foot. i still find 31mpg a bit hard to swallow. and i know third gens quite well. although id love to think they were capable of that. not saying youre a liar, just youre definatly the only person ive ever heard of to get those numbers from a third gen.

the newer LS1 powered cars would get 30 on the highway if you behaved though. sure you didnt mean to say 97 ;)
 
K5Greek said:
Dont forget that even thought they get better technology they also weigh in a little more than our trucks and end up weighing more after each generation.
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ya I thought about that when I was looking for an example, should have added that in there.
 
Food for thought

It seems like the best way to improve miles per gallon is to watch your rpms and driving style. I have been experimenting lately with a gas motor. If you can keep your rpms below 2K, mileage will be optimal. Highway driving does not increase your mileage by itself. There is a sweet spot in there of optimal rpms and speed that depends upon you vehicles gears, motor, tranny, weight, etc.. The closer to 55mph the better the mileage in general. I started setting my cruise control at 64mph (down from 75mph) and gained 4 mpg (14 to 18) in my DD driver.
 
CUCV2 said:
It seems like the best way to improve miles per gallon is to watch your rpms and driving style. I have been experimenting lately with a gas motor. If you can keep your rpms below 2K, mileage will be optimal. Highway driving does not increase your mileage by itself. There is a sweet spot in there of optimal rpms and speed that depends upon you vehicles gears, motor, tranny, weight, etc.. The closer to 55mph the better the mileage in general. I started setting my cruise control at 64mph (down from 75mph) and gained 4 mpg (14 to 18) in my DD driver.
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Thats what i do, sometimes i feel like im the only one going slow, but i can pull 18-20 on the highway in my yukon. and i really honestly feel bad if i put it to more then 1/3 throttle around town, unless someone wants to drag:D my last tank was half hiway/half town and i averaged 14.5 mpgs throughout. not too shabby for a fullsize suv
 
really depressing.

305ci
39.5 tires
20lbs front tire pressures
30lb rear tirepressures
3.73 gears
700r4

7.6MPG wheeling
8.6MPG higway

I cant wait to see what it is when i get 5.13s
 
CUCV2 said:
It seems like the best way to improve miles per gallon is to watch your rpms and driving style. I have been experimenting lately with a gas motor. If you can keep your rpms below 2K, mileage will be optimal. Highway driving does not increase your mileage by itself. There is a sweet spot in there of optimal rpms and speed that depends upon you vehicles gears, motor, tranny, weight, etc.. The closer to 55mph the better the mileage in general. I started setting my cruise control at 64mph (down from 75mph) and gained 4 mpg (14 to 18) in my DD driver.
Click to expand...


yep i keep it around 2k not much higher than 2300 and that seems to help out alot. i noticed like once or twice at WOT will kill MPG

i wanna get some gears and headers and see if it helps any.. trying to think of some ways to lose weight also
 
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