what brands to get for tune up

[CAP1]

350 sorry

 definitely rapid fire plugs. either napa or acdelco for cap/rotor/wires. new upstream o2 sensor. fuel and air filters. if you're port fuel injected, run what's called a motorvac injector cleaning. most shops charge about 100-150 for that, but it is well worth it. if you can't afford that, toss a bottle of techron in a full tank of gas.

[Captain Virgil Hilts]

That will almost certainly be a TBI engine. A can of SeaFoam every so often should help the injectors. Try to find gasoline with no ethanol if you can. The ethanol, either 10% or 15%, has 1/2 the energy of gasoline, meaning 10% ethanol costs you 5% fuel economy, and 15% ethanol costs you 7.5% fuel economy. Ethanol also kills the older injectors and fuel systems. If you can't get ethanol free gasoline, then Lucas Oil makes an additive that seems to work well.

By the way, the actual percentage of ethanol varies wildly. I've seen 10% ethanol gasoline actually have as much as 22% ethanol. It doesn't really blend worth a damn.

[Dragon]

That truck new only got 11-14 mpg city.  What do you really expect to raise it up to?

1993 GMC Sierra 2500 4WD 8 cyl, 5.0 L, Automatic 4-spd, Regular Gasoline
12  City
   
14  Combined

17  Highway

[f35raptor]

Im just trying to get what ever i can out of ut. I know we drove this trucj from rock springs up here to twin falls idaho. And only used two gas tanks worth three years ago.i went and filled it up there other day and made a trip out to burly idaho and used half a tank for the full trip. Im just trying to get the best gas milage out of this truck as i can.

[homersipes]

not to sound like an arse, but it is a 3/4ton pickup the mileage is what it is, I drive the same truck just newer and it sucks to fill up, but thats the price you pay to drive big toys.  If I was trying to get better mpg I would sell it and get a 1/2 ton which gets way better mileage.  That said dont take it the wrong way, I see what you want, but it aint gonna happen.  Have you thought about getting rid of it and getting a smaller truck?  I had a 1990 gmc z71 1500 and got 20 mpg on highway and about 15-18 city, I spent more keeping it full of oil than gas

[Captain Virgil Hilts]

not to sound like an arse, but it is a 3/4ton pickup the mileage is what it is, I drive the same truck just newer and it sucks to fill up, but thats the price you pay to drive big toys.  If I was trying to get better mpg I would sell it and get a 1/2 ton which gets way better mileage.  That said dont take it the wrong way, I see what you want, but it aint gonna happen.  Have you thought about getting rid of it and getting a smaller truck?  I had a 1990 gmc z71 1500 and got 20 mpg on highway and about 15-18 city, I spent more keeping it full of oil than gas

You do. The guy said he was keeping the truck. Does it offend you that he is interested in doing the best he can with what he has?

A 1/2 ton weighs about 500 pounds less, at most. Same aerodynamics. Just less gear, weaker powertrain, and sometimes less power. Not a lot better mileage. Usually about 2MPG, maybe 4, at best. Hardly worth a trade, especially if he has to pony up much difference.

[f35raptor]

I actually owned a half ton tryck had a 85 dodge ram with the slant six three speed. Got wondrrfull milage was a good work truck, except it sucked for horse power couldnt get her up a single big hill with out going 30 up a 50 mph road. This last summer i got it a car accident truck was a lose l. Insurancr gave me 1500 to get a different rig so at the time this was the best deal i  could find. This truck is alot better then the half ton i had. Like i said im keeping it for noe. Was just tryinh to figute out what steps i could do to improve the gas milagr. Tha.ks every one for responding ill give all the idras a shot.

Ben