first of all let me just say im new to this websight. but any ways does anyone know how to get better gas mileage in a 94 silverado 2500 5.7 4x4 because im only getting about 10 city and 13 highway any suggestions will help

 

About how many miles to you have on the truck?

 

With a 5.7L 350, that seems bout right. 6.0L new trucks are getting bout the same. Add cold air intake, 1 in 2 out catback dual exhaust system, as long as you can refrain yourself from getting onthe throttleso as to hear your nice sounding exhaust, you'll be ok, but i haven't been able to do that yet. Different gearing might help but.......... can be expensive just to get a bit better MPG's. I'm sure someone with a lot more knowledge than myself will chime in. My '03 Silverado has the 4.8L and with what i described above, i'm hoping to get better gas mileage as soon as i can stop wanting to hear her BLAAAAAAAAAAAT so much. I got i think it was like almost 17 mpg last summer on a road trip to Massachusetts. That was before the catback system. Around town, i was getting about 15 on average. I only live 3 miles from work and downtown, so i go thru stop n go traffic alot. Or secondary roads. My wife has an '02 Avalanche with the 5.3L, and she travels about 30 miles one way to work. Half of it is highway driving. Her Av has a 31 gallon tank, and back n forth to work 5 days a week, she uses 1/2 tank of fuel, which in my mind, is not bad at all, and she has the drop in K&N filter, and used to have Gibson catback system, but had to replace it, so she went with oem exhaust system. She weren't fond of the noise from the Gibson exhaust, but was what came with it when we bought it. Just my .02 worth, Jim

 

almost 149000 miles

 

either a new filter (k&n, true flow, aem) or an intake... a throttle body spacer, and exhaust will help your mileage... also just general maintainence things like spark plugs and whatnot if they haven't been changed in a while

 

My 5.7 delivers anywhere from 17-19mpgs highway when I'm treating the bastard very gentley.
It's a whole other story when I'm 'city' driving. In the city, it just plummits. I'm talking 8-10 mpgs. That is mostly due to focking stop lights, speed cameras, general ********* who drive 25MPH in 40MPH zones...

Traffic = Makes my blood boil. That's 150% of the reason why I bought a house out in the country. There isn't a single stoplight for 8 miles. (The only stop signs are also very easily 'blow throughable'.)

Get a drop-in K&N air filter. That's my only advice. They're $55 @ Autozone/Schucks.

 

have a K&N air filter and it really didnt make a difference i dont think but i plan on getting a throttle body spacer and a exaust would anyone know about how much more those things will get me

 

CAI, TBS and true dual exhaust should help. my 93' with a 350 got 13 city, 16.5 highway with normal driving. The single in dual out is too restictive on those 350s.

 

Friend of mine said he got better mileage doing the following:
K&N air filter
change to Synthetic oil
add throttle body spacer

I also have a 3/4 ton with 350: I suggest,
tuneup
add seafoam to fuel system
change differentials to 3.73 or higher
drive no faster than 62 mph

that about as good as it gets, if not good enough, then trade up for new technology.

 

...or drop $750 on a early 90's Geo Metro. (40+mpg W0ot w0ot!)

That way you can just rape the **** out of it and throw it away when it's no longer fun.