I'm averaging 300km's per tank at a cost of $50 to fill from empty. Dosnt this sound a little low?? The engine is running at 19pounds of vacuum. What should the vacuum be reading?

I also just replaced the spark-plugs and it looks like the engine is running lean. The plugs are mostly white, showing signs of detination and frayed pieces of the plugs are broken off. I am now running new plugs and 94octane and its running much better.

edit: its a 1990 2door 5sp 3.0

 

i have the 3.0 v6 in my 91 4runner its an automatic. Brand new motor timing belt distributor wires plugs everything. I get 350-360km for the 65L tank CITY. The most ive got on highway is 425km for 58 litres. And thats driving it slow and steady no punching it. So 300km for 50$ sounds about right.

 

19 pounds of vacuum sounds like a lot. considering vacuum is usually measured in either bar or inches water column or mercury, I don't know what you mean.
sorry for sounding rude, but if I don't know what you mean, can't help.

 

Theory has it, that the higher the vacuum; the better fuel milage you will get.

Say its -30 -20 -10 0 +10 +20 +30lbs

Everything under 0 is vacuum, anything over 0 is boost (i know 3.0 arent turbo) now once you start getting close to 0, the fuel milage goes down, if you're pushing 20psi of boost your millage is gonna SUCK Hook up a guage and drive around, and you'll notice that when you're barly on the throttle, it'll read good vacuum vs bad when on the gas.

This is simular to what i mean
http://www.youtube.com/watch?v=MBYVZLRyQjk

 

Wow this sucks, I wrote a nice long reply and the internet froze. 1st writeup made sense, this one sucks Hrm

Think of it like this. The guage reads -30 -20 -10 0 +10 +20 +30 in forms of psi. Everything under 0 is vacuum and everything over 0 is boost. Lets say the 3.0 has a turbo on it, and at idle it reads 22psi... (to the left of the 0) and once you floor it, the guage goes up to the +20psi mark meaning that its sucking back the fuel to fuel the injectors for the turbo. Same applies to n/a and should theoretically read 0 and no more at WOT meaning that you're eating fuel.

Here is somewhat what I mean
http://www.youtube.com/watch?v=MBYVZLRyQjk

 

i dont get it, every time i post... it dosnt show up

edit; im starting to get a little pissy. every time i write a write-up it dosnt show up..... GGGRRRRRRR\


im tired of explaining so watch the vid.

http://www.youtube.com/watch?v=MBYVZLRyQjk

 

I get over 500km a tank highway with my 91 4dr 5spd 3.0L V6 and around 360-380kms a tank in the city. Its all about care and regualr maintenance, also a few little mods to the intake.

 

girlcrazy 4, dont worry, all three of your posts popped up...

if its any consolation i only get a MAX of 275 miles on 15 gallons...

so thats what, 442.5 on 56.7L right? hrm... guess its not as bad as i thought...

 

I've got a vacuum gauge on my dash and at idle my 3.0 usually runs with between 18 and 20 psi of vacuum depending on how high the idle is. While decelerating using the engine it jumps up to 22-24 psi vacuum. While driving it drops to 0 at WOT but I like to try to stay above 10 psi vacuum when I'm just cruising around. I heard somewhere that keeping it above 9psi is supposed to save you gas. So far it hasn't.

 

Weird. They werent there last night when I went to bed. Anyways, looks like i'm going to hook up the guage and drive with it for a week to see if there is a difference. I've actually only put 200km's on the last tank and its at 1/3... so I figure i can push another 100 out of it at MAX. I'm running stock size mudders (30" bfg mudders) so this shouldnt effect the fuel much.

 

I think your first 5 posts will take a while to show up because it runs through some software to try and stop spam.

 

maybe try, when you get the chance and the money, switch it up to 31s... may help a lil bit...

 

only 8 posts huh, new to toyota, that sounds about right for a 3vze engine.

 

I usually get close to that in the winter (alot of city driving for me, like 5 min drives..) but in the summer I get up to 21mpg hwy.

Are you running bigger tires then stock? Whats your gearing in the diffs?