Best MPG

[kerrige]

My girl friend has a 2000 GMC Sierra ECSB 2wd with a 4.8 60e bone stock
She is only getting 17mpg average and that just isn't what she or I would like to see. Long commutes for her work are killing her budget wise and I convinced her to keep the truck over a 2003 GranPrix...... so.....
SO What i would like to hear is the best MPG anyone has gotten and how they got it.
I plan on a CAI, Tune, and maybe some gears........ I know exhaust, and efans would be good as well
Just wondering what would be the best/most effective things to get.

Oh she is also running synthetic and fresh tranny fluid so that's already done and she really doesn't care too much about performance just fyi.
Thanks in advance.

[pl4yboy]

My sisters bone stock 4.8 4x4 doesnt get more than 17 hwy ever.

[ls1ram]

Its more driver habbit then it is tune, if she is a speeder on the highway 75+ she will never see over 18, if she cruizes closer to 65-69 then she may see better mpgs, mobil 1 does sell a fuel saver oil that is a 0-20 weight synthetic that may help, but really by the time you buy the CAI, get a tune, buy a free flowing exhaust, you have spend big money, and the mpg gains would tak 8-10 years to break even with cost.

Sounds like she needs a car, but if you do keep the truck replace the stock air filter, fuel filter, if there is some weight reduction that is easy then do it, lower it a bit? Raise tire pressure, alot of small things that might help, but again dont go spending $100's of dollars for 1-2 mpgs

I think it would be a different story if she liked the truck and wanted to keep it, but if MPG's is a consern then a truck isn't for you. A good front wheel drive car will easy get mid/high 20's on the highway and with good tires it should be safe in the winter/snow time

[pl4yboy]

I owned the truck and I never got over 16-17 either. If I can get 20-21 in my crew cab 6.2, I should be able to get better than 16 in a 4.8 rcsb. It's not because of the driver in this case. It is the fact that the 4.8 is lugging constantly.

[kerrige]

She loves the truck she was only wanting a car for the mpg and she hated driving it. She feels much more comfortable in the truck. (she is 5'1'' in the car you could have sworn a ghost was driving lol) Thing is at 3 dollars a gallon she will be saving 50$ per month if she can make just 3mpg better.(she drives about 2000 miles a month and gas is $3.40 in Scottsdale AZ) So if I spend 500 here it will pay off in less than a year to me and its really more like a gift from me to her. She drives it pretty nicely but even highway cruising it only get like 18mpg. So which ever mods have seen the best results is what I would like to get.

[Botlfed]

I had the same truck but with a 5.3 got around 400 miles a tank, traded that bitch in for a toyota suv and it gets 28 mpg, just sayin that old of truck and that little 4.8 is struggling just to pull its ass around tell her to get like an ext cab s10 extreme if she wants mileage and a truck.

[Frenchy]

4.8s are just pigs, it's already been said but just to little of a motor working too hard. Try a gear set around a 3.90 maybe, good tune, fuel mileage is a bitch to chase.

[kerrige]

fuel mileage is a bitch to chase.

Ironic haha my name is chase and i have driven a suburban jeep a sierra and sdime(4.3+led foot) my average mpg must be like 14 lifetime. I figure I will buy one of those TDI jettas one of these days lol

[Mang213]

On a roadtrip from DC to Birmingham, Alabama and back I averaged 21 mpg. My right foot is pretty damn heavy and I was doing 75+ mph for the majority of the trip (if traffic allowed). I have an 07 rcsb 4.8 with 3.23 gears, a 93 tune, and a cai. I feel that a set of gears and a good tune would probably help out, but like Pl4yboy stated, with that 60e it's just lugging alot. Throw a 6L80 in it It's got deep gears up front and two overdrives. I would get gears myself, but Im going to convert to the six speed as soon as funds permit.

[Mang213]

btw my city average is just under 17 mpgs