I have a 2000 4x4 2dr blazer with the 4.3 vortec, it runs smooth, but it seems a little sluggish. I have nothing to compare it too because i purchased it about 2000 miles ago at 133k miles.

I get an average of 14.5 mpg, i accelerate really softly, around 1800-2000 rpm, and get passed by everyone else in traffic. If i ride the gas a little more, i can only just keep up with traffic and my mileage doesn't go up or down much.

The brakes are not dragging, i changed the oil with a good synthetic, ran some techron, changed the plugs, the color was good. changed the air filter. Some 1500 miles later i'm still getting 14.5, i have experieced better mileage running mid grade gassoline but never really continued.

Are they any other things that could be wrong? and ideas, i am willing to try anything at this point.

 

right there with ya !!!!

i have never been happy with the 15-16 mpg i get out of my 95 blazer 4x4

everything you have done is a step in the right dirrection, maybe map sensor or egr valve?

otherwise just get use to it, unfortunately

 

check ur tires even if theyre a lil low that will negativly affect ur mpg's also consider switching to an H/T tire if you spend most of ur time on paved roads. i dont really know much about the techron, but try running some sea foam through i know many ppl on this site have done it and swear by it, also if running a higher grade fuel gets you better mpg's id say keep doing it and try to run the highest grade availible.

 

Your lucky! Around town I only get 18ltr/100km. That's about 12/13 mpg (US)!!!

 

What size and type of tires do you have? Keep'em aired up. I get 16-17 hwy with my mud terrains and 17-18 hwy with my all terrains. Also, make sure the engine is running about 200 degrees... if the thermostat is letting it run cooler, that will affect mpg.

 

Right now i am only running 235-75R-15 Im kinda getting worried about going to a bigger tire, i would like to run a 31x10.5 but if i am already sluggish now i am worried that i will seriously get left behind in traffic.

 

best bet would be to do a pcm thing
i get about the same although on the highway i get around 20mpg

 

hey if you makes any of you feel better i get 8 in my full size

 

i get around 13 in the city and 20ish on the highway. I run premium with my 31x10.50s

 

I seem to get 15.5 highway or city, its just always 15. I was just a little bummed becasue my dads 89 blazer 4x4 door with the 4x4 got 18 city 22ish highway, and the only difference is the TBI engine and a free flowing exhaust.