Gas Mileage

[MT wheeler]

2002 8.1L Chevy 10mpg in town and 13 on the freeway.

In my Scout when I had the 33's on it with 4.10 gears I would get 14-15 on the freeway and about 11-12 in town. I swapped axles to 3.08's and dropped to 8-9mpg on the freeway .

Anyone seen/heard/used/etc. one of these?
http://www.condensatorsales.com/

Almost one of those things that's too good to be true but for the price it might be worth a shot.

 

[steve_kibbe]

2002 8.1L Chevy 10mpg in town and 13 on the freeway.

In my Scout when I had the 33's on it with 4.10 gears I would get 14-15 on the freeway and about 11-12 in town. I swapped axles to 3.08's and dropped to 8-9mpg on the freeway .

Anyone seen/heard/used/etc. one of these?
http://www.condensatorsales.com/

Almost one of those things that's too good to be true but for the price it might be worth a shot.

I think thats a little sketchy, a 97 f250 4x4 with a 460 is not going to get 20 mpg

 

[hero]

I'm getting about 10 MPG with an '83 blazer 2 1/2" lift 3" body lift. 454 with headers and Holley carb, TH350, 3.73 gears and 38" TSL's.

 

[Russell]

I think thats a little sketchy, a 97 f250 4x4 with a 460 is not going to get 20 mpg

About all that thing will be good for is making that fella money, lol

GM and other manufacturers spend hundreds of millions each year reasearching ways to live up to both economy and emissions standards. If some miracle basket with silica gel in it was able to get a big block to achieve 20 mpg, and reduce emissions, you can be assured that there would be one on every vehicle on the market today, lol

There are only two things that'll get you significantly better milage -- First is gearing (overdrive, rear diff ratio etc matched to put your engine in it's "sweet spot" at your typical cruising range, much like my 77 is geared for), and second is a brick under the gas pedal along with the secondaries being mechanically held shut, lol

 

[86haubs]

There are only two things that'll get you significantly better milage -- First is gearing (overdrive, rear diff ratio etc matched to put your engine in it's "sweet spot" at your typical cruising range, much like my 77 is geared for), and second is a brick under the gas pedal along with the secondaries being mechanically held shut, lol

You forgot #3.....put a Honda coil spring on your throttle linkage and let you wife drive!!

 

[MT wheeler]

I think thats a little sketchy, a 97 f250 4x4 with a 460 is not going to get 20 mpg

I would have to agree. Kinda like the "guy who built a carb to get 80 miles a gallon on an old v-8 but he mysteriously disappeared".

 

[WRENCH-HEAD]

I actually had two of those things setting in the garage collecting dust and I just threw them out. All it looked like was a glass jar with a couple of hose fittings on the top. Nothing else to it. Can't see how it would make any more of a difference than the original charcoal canisters on our trucks.

 

[1985_K5_Silverado]

I would have to agree. Kinda like the "guy who built a carb to get 80 miles a gallon on an old v-8 but he mysteriously disappeared".

I have some inside info on the guy with the 200mpg carb swirl thing, and it involves the Illuminati, a barber, and a razor. More on that later.

 

[goldwing2000]

I've got a stock 91 w/ 260K and 31's on it. I'm around 15 with mixed driving. I assume it has 3.73's. Would 3.55's give better MPG? It should get better when I lose the top this spring.

Actually, the 3.55s would probably decrease your mileage.
If you do mainly highway driving (at least 75-80%) without a lot of stop and go, the smaller number gears would help mileage due to the decreased RPM.

But if you do mainly city or mixed driving, the engine will be working harder with the numerically smaller gears. That would cause you to use more throttle to achieve the same acceleration thereby using more fuel.

 

[jfman]

Daym I tought my lightning was getting bad mpg.





These k5's are pretty sweet looking however.

 

[RootBreaker]

I took my truck to work.... 36 miles one way... got 11mpg....
however I have to floor the truck to get it moving when im at a light.... so just added vortec heads, intake, comp cams cam and hopefully less right foot to get moving... so hopefully same or better gas mileage....

I will someday do a nv4500...... OVERDRIVE!!!!

 

[NEK5]

with the 350 and 700r4 in my sig i get about 11-13 mpg with my heavy right foot

 

[crawlink5]

And still glad I have the 4bt after re-reading this thread...

 

[Russell]

This thread made me miss my old 77 2wd short step for approx 2.5 seconds... I much prefer my 07 Duramax which gets me around 20 mpg on the highway

 

[RootBreaker]

This thread made me miss my old 77 2wd short step for approx 2.5 seconds... I much prefer my 07 Duramax which gets me around 20 mpg on the highway

wow holly old threads.. yeah i have since fixed my problem from above..
bad distributor where advance wasnt working.. but it will still get 15mpg and it has way more power now..

but i too enjoy my DD '08 z-71 w 5.3.. getting me 19mpg

 

[JCJ]

I would check to see what my mileage is, but I haven't filled up my Suburban in a quite a while. That 40 gallon tank seems to be a lot larger when you're fueling for some reason.

But anyhow not sure what I'm getting with 3:73 and 35"s I would venture to guess around 10-12. It's a 90 GMC 4x4 350/700r4.

 

[Confedneck]

having tried this with 2 separate trucks, it makes no noticeable difference. i tried it with an 82 C10 350/350 3.08s on 235 75 15s, and with a 1993 C1500 5.0/4L60E 3.42s, on the same exact tires and wheels. whether the gate was up, down, or completely removed, it made no noticeable difference.

ya figure they might pay engineers big money for a reason?

 

[ohio]

granted these are 6.2 diesels but

'82, 1500, 2wd (5 bolt hubs), standard cab and long bed, everything else stock. i get around 21-24 depending on if i screw around and blow smoke or whatnot.

'84, 1500 (has 1 ton rear springs since the last last ones broke, 4wd (6 bolt hubs), standard cab with a long bed, everything else stock (except for weight saved by all the rust that has fallen off the bed ) my old man gets around 17-18 tops. he does however have a 100 gallon diesel tank (however it's empty 90% of the time) and a bed-side toolbox (not that the toolbox would add enough weight to matter).

aside from the mechanics of the 6.2, one of the reasons i would kill for a 6.2 blazer over a 350 is mileage.