great mileage

ok so my buddy ask'd me to come down to his place in san marcos and hang out for a couple days. so i had just done the drive to barona casino down there with my buddies and got a combined average of 16.5 which pissed me off. almost all highway. but we were averaging 80ish most the time. so then i deciced that i would drive very conservatively this time and i was by myself so i wouldn't succumb to peer pressure. so i ended up getting 20.0 mpg. total trip was 220 miles on 11 gals of fuel. it would have been better but i let my friend drive for about 30 miles of that cause i had to drop him off so wear and needless to say he didnt drive easy. so my advice is to keep ur speed around 65, dont haul up hills causing severe downshifts. just be easy. i think 20 mpg for a 6k pound truck is pretty good, just thought i"d share my experience. also anybody think a throttle body spacer will increase this enough, had it on my jeep and did wonders.

this is really true...if you can keep it under 2000rpm at cruising speed your mileage will vastly improve...i never thought it made that big of a difference but i will be damned if it doesnt :D

20 mpg is great, get a custom tune and just maybe get more out of her ;)

The money spent a tb spacer would be worthless unless it had a nitrous jet....:burnrubb:

You would be better off getting a port and polish job on your stock throttle body by someone who's reputable, better results per $. ;)(would be around the price of a tb spacer)

edit: dang im slow at posting, was none before i dropped this... lol

Our trucks don't respond to rpm so much as they do stress on the engine. You can be in 4th gear with the converter locked turning 1700 rpm but if you have the pedal down just shy of downshifting your gas mileage will be crappy.

If you don't believe me, go do run on the highway and check out your injector duty cycle.

I say this speaking from experience both doing manual calculations, logging with EFI Live, and my aeroforce also does a pretty accurate job of current MPG estimates.

Wind resistance is the biggest thing.

Before I lifted my truck, i was getting 26-27 mpg if i drove 55-65 whole time.

Now I can still bust out an 18 every now and then, and that's with big ole tires. Think truck was only rated at 19 new.

Normally i get 12-14 tho. (i normally set cruise at 80, and that's a lot of wind)

Full synthetics, ud, electric fans, intake/exhaust/programmer.

How did you get 26 MPG? At stock height trying my hardest to stay out of the gas I could only muster 18MPG hwy. Do tell you MPG secrets!

full synthetics. had a 3.42 at the time. intake. cats/straight pipe exhaust. Electric fans. 80mm tb. Tonneau cover. i'm not sure. had a big debate on ctw about it. Did it 2 seperate times. I DO use lucas fuel additive on long trips tho. i seem to get 1-2 mpg better when it is in my tank. Not quite sure why. The speed is biggest thing. At 55, truck is almost idling.

I've mustered up 28, shifting below 2000, keeping it around 60. K&N filter, Magnaflow muffler and tire pressure at 40. Next pay check is a tune for the little bugger and hopefully hit 30 mpg.

6.0 gets best mileage when kept under 2000 RPM on the highway regardless of other factors assuming everything is working OK and you don't have a flat tire. Mine can get almost 17 in perfect conditions.

Keeping it under 2000 RPMS, I've been getting 19 in mine. Now normal driving, I get 16.

Yeah, MPGs all depend on Cd, gearing, tire PSI, how good your tune is, and throttle input. In a stock height 2WD truck with a 5.3L, 4.10 gears, a good live tune, and keeping the truck around 60 mph, I can get just a touch over 21 MPGs.

if I do mainly highway cruising I can get 21-22 mpg, but if its all city driving then only about 14-17. I have a heavy foot too, so I cant complain

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Originally Posted by Maui4x4

The money spent a tb spacer would be worthless unless it had a nitrous jet....:burnrubb:

You would be better off getting a port and polish job on your stock throttle body by someone who's reputable, better results per $. ;)(would be around the price of a tb spacer)

edit: dang im slow at posting, was none before i dropped this... lol

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how muuch u thinking for a port and polish job on stock throttle body

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Originally Posted by sleeper1500

I've mustered up 28, shifting below 2000, keeping it around 60. K&N filter, Magnaflow muffler and tire pressure at 40. Next pay check is a tune for the little bugger and hopefully hit 30 mpg.

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I must admit I'm pretty skeptical about this. I've seen a lot of MPG threads and no one has ever come close to this. Then to say you did it without a tune makes me even more skeptical.

How did you calculate it?

I'm curious, as to mistakes are often make. Especially if you're converting KMPG to MPG

4.3,5 speed, 3.23 gears, A/C off, highway driving. It's also a stripper truck, the only weight adding option is the A/C. I calculate it as KM/L x 2.82

The 28 was a one time thing, perfect conditions driving a little better than reasonable, I average 26 and got as low as 19 at one point (cheap gas and a heavy foot)

Since I can't afford to knock on 11's I get a little amusement out of trying to make it as efficient as I can, once I can hit 30mpg the V6's life in the truck is over.

right back wind, and TRYING to get good mileage...its def possible (but really boring)

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Originally Posted by sleeper1500

4.3,5 speed, 3.23 gears, A/C off, highway driving. I calculate it as KM/L(2.82)

The 28 was a one time thing, perfect conditions driving a little better than reasonable, I average 26 and got as low as 19 at one point (cheap gas and a heavy foot)

Since I can't afford to knock on 11's I get a little amusement out of trying to make it as efficient as I can, once I can hit 30mpg the V6's life in the truck is over.

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Ah didn't realize it was a V6. That explains a few things.

You know this is predominantly a performance site right:LOL:?

Just kidding with you man.

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Originally Posted by randomhero

Ah didn't realize it was a V6. That explains a few things.

You know this is predominantly a performance site right:LOL:?

Just kidding with you man.

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Haha yeah I'm well aware, but there is more to performance then going fast in a straight line.

ya and i love throwing this in the face of my friends, one has a dodge, gets 16 or 17 at best on highway, a new tundra, gets 16 on a really good day, a titan, which is about 17. i all told them and they are like are u serious dude, the dodge guy was at the chevy dealer that evening trying to negotiate a price

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Originally Posted by Mang213

if I do mainly highway cruising I can get 21-22 mpg, but if its all city driving then only about 14-17. I have a heavy foot too, so I cant complain

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You have DOD on your truck? I turned mine off.

The 4.8s dont have DOD, thank God. Im not sure how much harder it is to do engine mods, but it seems like a hassle if you have DOD. You turned it off in your tune, or actually just disconnected it?

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Originally Posted by Mang213

The 4.8s dont have DOD, thank God. Im not sure how much harder it is to do engine mods, but it seems like a hassle if you have DOD. You turned it off in your tune, or actually just disconnected it?

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I wasn't aware that you had a 4.8 sorry. My 07 4.8 didn't have it either. I turned it off in the tune.

I get between 18-22 on the highway according to the formula in hptuner I have and it us pretty acurate from the last time I checked.

miles / gallons of gas = best way to tell mileage IMO

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Originally Posted by sleeper1500

...but there is more to performance then going fast in a straight line.

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And what is that??? Performance cruising? Performance braking? Performance Canadians?

Your mom knows all about Canadian Performance

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Originally Posted by pl4yboy

I wasn't aware that you had a 4.8 sorry. My 07 4.8 didn't have it either. I turned it off in the tune.

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yeah I have the lowly 4.8, but to be honest, this thing runs better than my old '03 silverado with the 5.3. Im sure its the heads, because as the rpms climb, the truck seems to WANT to go faster. The old truck had real good low end but the power wasnt as linear

Whats DOD?

displacement on demand
GMs version of cylinder disabling to save gas V8 to V4

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Originally Posted by sleeper1500

Your mom knows all about Canadian Performance

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Slow and not very good?

sleeper, the mileage you posted in canadian mpg or us? my old silverado 2wd ecsb would get 24mpg, think thats about 18-19 in us gallons.

:lol:

thats funny

ok question, my truck will be cruising in 4th gear around 1600 1700 rpm. thats like basically coasting on a flat with barely any resistence, then i'll hit a slight hill and the rpm will jump about 200 but remain in 4th cause i watch it on my hyperpac screen. does my truck have DOD or is that just how overdrive works. thanks in advance

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Originally Posted by neilbachman

ok question, my truck will be cruising in 4th gear around 1600 1700 rpm. thats like basically coasting on a flat with barely any resistence, then i'll hit a slight hill and the rpm will jump about 200 but remain in 4th cause i watch it on my hyperpac screen. does my truck have DOD or is that just how overdrive works. thanks in advance

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That's the torque converter locking and unlocking. Overdrive just means that the transmission ratio is lower than 1:1. I just learned that second part about a month ago, LOL.

so is that ok for the trans

yup, its perfectly fine!!! theyre made to do that