How far on one tank of gas

Hey guys,

Thought I'd share this with you. I'm not sure how everyone else is stacking up to this, but I thought it was very impressive.
A couple of weeks ago, I installed a cam/springs/rods and an 02 pcm in my father in laws 99 GMC 5.3L ec. It turned out great, we can't wait to take it to the track!

Well, on the way to Hi Way auto, we filled up just down the road from my house, on the way there, we hammered it many, many times and averaged about 85mph.
On the way back, we were carrying the engine, and took it easy all the way home.
The total trip was 415 miles, we made the trip on one tank of gas. There is no doubt in my mind, we could have went 450miles / tank if we took it easy on the way up there. About 7 miles before we got home, the fuel light went off. So, we weren't completely empty on the way back.

Anyone else have an experience like that.

The 02 pcm and really the cam woke up the truck very nicely.

later,

allen

Made it from houma, la to your place on one tank and that was 522 miles. I can't wait to put the 02 pcm on and see the difference.

I can barely make it 200 miles in my 01 Suburban. Damn lead foot. :burnout:

I would love to get that kinda milage in my denali. So far the highest that i have seen the trip meter at was 328. Hey Jerry how much did the sts system effect your gas milage?

437, when I had the cam and blower :smile:

the most i have gone on one tank is 479 miles (26 gal tank) when i filled up she drank 25.7 gals of gas....she was thirsty!

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Originally posted by 03Sierra-sts@Dec 7 2004, 03:31 PM
I would love to get that kinda milage in my denali. So far the highest that i have seen the trip meter at was 328. Hey Jerry how much did the sts system effect your gas milage?

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I picked up 2mpg city and hwy and 3.5mpg towing. Also I have a 37 or 38 gallon tank. It takes about $60 to fill up.

Filled up before I left for Transgo install ran 80-90 all the way up there to JAG w/ a "few" sprints to pass some slow people. Got install done, went to run truck w/ Joe to see how it turned out w/ a few more sprints. Picked up bro. to go get food, another "sprint" to about 80 on the feeder. Waited in line to get food. GOT HIT !!! :tantrum: Pissed off now... :grr: More "sprints" to find a car wash to get coke out of truck. Got two more cokes. Haulass back home w/ more "sprints" to pass some more slow people. Get back home backing into driveway "Low Fuel" lights up. Fill up the next day mileage shows 407.x miles...17.6 MPG :thumb:

Thats awesome but at $2 a gallon is getting kinda expensive to drive this thing around. I used to have the 4.3 but I bet this LS1 will give better gas, I'll make sure I post once its running.

Hey allen,
I wish my truck got that kind of gas mileage. With the 80-e in it, my 5.3 is just sucking down the gas. I checked my gas mileage the other day when i filled up, and according to the numbers, i am getting an unimpressive 10.4 mpg. i think i drove 241.8 miles around town on that tank. Any ideas??? Before i put in the 80-e, the mileage was a lot better than this. I didnt think it would have made that big of a difference.

Matt in california

I average 15.5mpg in the city and get nearly 20mpg on the freeway... I just cruise about. I don't recall the last time my truck's seen over 3000rpm :laugh:

Also I fillup around when I'm down 20gal of fuel. I'm quite pleased with the economy I've gotten!

This is all with being undergeared with 285ATs on 3.73:1 gears... my secret is not to go over 70mph on the freeway.

I get about 15.5 period. Doesn't chang between the highway and city.
I don't drive fast, I drive the speed limit at all times. I wish I knew what I could do to improve this gas mileage.

My little 02 Chevy Cavalier gets 32mpg!! Thank god for 4 bangers when the gas prices go up.

im getting shitty gas mileage right now... ive probably lost 2-3 mpg.

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Originally posted by onyx@Dec 9 2004, 02:05 AM
im getting shitty gas mileage right now... ive probably lost 2-3 mpg.

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It's probably the big ars fuel pump on top of your intake. :laugh:

Went on a trip to Florida for Thanksgiving and averaged 22mpg. That was with 26" tires and a 2500 stall and an STS turbo kit. Best milage it has ever gotten.

i think i am going to have to go to (THROTTLE MANAGEMENT SCHOOL) to be able to figure that out.

It will be interesting to see what 02Denali's fuel mileage is after the transmission swap-out. I keep seeing the 4L80E's losing considerable fuel mileage vs. their 4L60/65E counterparts. I guess you will have to break the trans in conservatively so we can get some comparisons.

I swapped a 4L80-E into my truck about 4 months ago and i am getting around 10.4 mpg around town. I am hoping there is something else going on to make me get mileage that crappy.

I can go about 390-400 miles between fills, and 18 gallons is the most it ever takes. I think that is about 22. The least it ever got was driving to Houston with the big stall and racing included at the track was 19.5 MPG.

Jeff

I got 19.x - when it was brand new
Drove 400 miles at 65 even
I have not checked it with the new PCM
Crap - I havent driven it in a months