Mpg problems
Professional
Joined: Feb 2011
Posts: 153
Likes: 0
From: Iowa
Whoever had the truck before me put exhaust on it without a cat and there was only one O2 sensor into the new pipes. I guess I will have to chase down the other O2 sensor plugs and try and get a high flow cat in there or a couple bypass sensors.
I guess whether or not I do something like that depends on how many more miles I can get. I get 13 right now. What is the most you guys with V8s think that I could get out of it?
I guess whether or not I do something like that depends on how many more miles I can get. I get 13 right now. What is the most you guys with V8s think that I could get out of it?
Record Breaker
Joined: Mar 2009
Posts: 2,181
Likes: 3
From: Battle Ground WA
Depends what kind of driving you're doing, for mostly town that sounds about right for a V8 auto. I'm around 14 for town, averaging 16 mixed right now but I have a 5 speed.
Registered User
Joined: Mar 2011
Posts: 2
Likes: 0
From: 15 miles west of Southwest corner of Wyoming
I get 20 to 21 MPG with a 5.2 5 speed in a 95 club cab 4x4. I march I pulled an other 95 club cab from southern Utah to norhern Utah on a toter and got 16. The bed of my truck was full of tools and equipment too.
My odomer is with in a 10th of a mile at 100 miles. Drive like you own it not like you stole it and you get much better milage.
My odomer is with in a 10th of a mile at 100 miles. Drive like you own it not like you stole it and you get much better milage.
Professional
Joined: Oct 2010
Posts: 184
Likes: 0
From: Georgia
I'll get 20 -21 mpg on the highway and around 16-18 in strictly town driving w/ the A/C on. Tires are 225/75's. Mobil 1 syn. oil. I try to keep my foot out of it.....sometimes. 
Since the float on my pump is stuck (guy who installed the new pump before I got the truck didn't line it up right,) I've been filling up around 300 mi. per the trip meter... give or take. I usually have 5 or 6 gals. left in the tank.
One of these days I'm going to drop the tank and re-position the pump. Getting tired of looking at that low-fuel light. For the time being, it runs like a scalded dog
so I'm not in a big hurry to start working on it.
Since the float on my pump is stuck (guy who installed the new pump before I got the truck didn't line it up right,) I've been filling up around 300 mi. per the trip meter... give or take. I usually have 5 or 6 gals. left in the tank.
One of these days I'm going to drop the tank and re-position the pump. Getting tired of looking at that low-fuel light. For the time being, it runs like a scalded dog
so I'm not in a big hurry to start working on it.
Record Breaker
Joined: Apr 2010
Posts: 1,745
Likes: 50
I am assuming you guys that are getting 19MPG have the V6.
What do you guys with the V8 get at the top end of mileage. I am at 13MPG now. I dont have an O2 sensor, will it jump up if I get one to put back on?
Also regarding the O2 sensor on a V8, there is just one O2 sensor that goes before the cat right? So if I have straight pipes and just have it in there about the place that it was, it should read correctly...correct?
What do you guys with the V8 get at the top end of mileage. I am at 13MPG now. I dont have an O2 sensor, will it jump up if I get one to put back on?
Also regarding the O2 sensor on a V8, there is just one O2 sensor that goes before the cat right? So if I have straight pipes and just have it in there about the place that it was, it should read correctly...correct?
I got as low as 15 with the V8 twice-- both while towing
Veteran
Joined: Dec 2011
Posts: 433
Likes: 0
From: Knoxville, TN
Funny thing...my 93 3.9 2wd, gets only about 14-15 highway. 10 or less city. I have fixed all my vaccum lines, new fuel pump, pres. regulator, filter, plugs wires cap n rotor, and o2 sensor. normal sized tires and no I'm not hualing anything constantly to get that poor mileage. I think there is a reason this motor has the nickname of "Boat Anchor 6" I find it amusing that a mild 5.9 will get better mileage long as I keep my foot out of it.