I've been doing a bit of reading and I see that there is talk of replacing the front O2 sensors in the exhaust to get better fuel economy. Does anyone have actual figures on the difference this made? I understand the theory of why it would make a difference, but theory can be totally different to reality.
What are your MPG's? I know most of you will roll your eyes when you read this since nobody has seen "good" MPG's in a 100. But I can get 16-18 on the highway cruising at 65-70. I average 15 in the city. If I drive with a heavy foot I can see 12mpg.
I have Bosch O2 sensors which probably do not make a difference, deckplate mod and straight intake tube. Oil changes every 2K
What are your MPG's? I know most of you will roll your eyes when you read this since nobody has seen "good" MPG's in a 100. But I can get 16-18 on the highway cruising at 65-70. I average 15 in the city. If I drive with a heavy foot I can see 12mpg.
I have Bosch O2 sensors which probably do not make a difference, deckplate mod and straight intake tube. Oil changes every 2K
What are your MPG's? I know most of you will roll your eyes when you read this since nobody has seen "good" MPG's in a 100. But I can get 16-18 on the highway cruising at 65-70. I average 15 in the city. If I drive with a heavy foot I can see 12mpg.
I have Bosch O2 sensors which probably do not make a difference, deckplate mod and straight intake tube. Oil changes every 2K
When I went to URE last month I was averaging 18.6MPG on I-85. It's got rolling hills, I was cruising at 70mph up hill and 85-90 downhill. By the time you get to the bottom of the hill you are going fast enough to coast uphill. Just watch for Fuzz when you hit the bottom
Reminds me, I used to run mid-grade and would AVG 13-15 on the highway. I went with Premium (91) 100% of the time. I'm almost positive it's cheaper to run the 100 with premium in it long term... I also feel that it runs a little better in stop-go traffic. I was in the middle of nowhere one day and filled it with unleaded. I got 12MPG and it was slow, bogged down and just did not like it. I know they are massive differences but, it's what I have found out and it works for me.
Before the O2 throws a code it will mess with fuel trim to the point that it impacts MPG. We've seen a number of users report similar results. 90-120k seems to be when the original O2's tip over.
Anyone know how long the 2nd gen O2 sensors last? This is the OEM ones that replace the factory original units. Just curious if expected life is still ~100k miles...
Before the O2 throws a code it will mess with fuel trim to the point that it impacts MPG. We've seen a number of users report similar results. 90-120k seems to be when the original O2's tip over.
150k and not sure on last o2 replacement. I use Costco premium all the time and was averaging 14 mpg(50/50 city/highway). Lately I am down to 12mpg with the same driving. I was thinking maybe costco upped the ethanol % and maybe that was the cause. But now I am suspecting the o2 sensors. No codes thrown yet.
I ran 91 exclusively in mine until I decided to give regular a try. Truck actually seems to run better and get better mileage with the lower octane fuel. Go figure.
That being said, I've never gotten better than 15.6mpg in this thing, and that was a rare occurance that only happened once. I average 13 mixed. I'm pushing 140k and I don't know if the original 02's have ever been replaced, but I'm not sure if my mileage is bad enough to warrant replacing them without a code being thrown.
You're correct. IIRC the front is short trim and the rear is long trim. Either way, it will affect mileage pretty drastically before it throws a code (according to others).
I replaced both front 02 sensors and I have 33" duratracs. Otherwise stock. I average 12-13mpg combined driving.
Flat highway I get about 17-18mpg, pure city 10-11 (12-13 overall avg) I do mostly city with a little highway here and there...
Pls note those mileage figures are uncorrected for the larger tires, so add about 5-6% due to fewer rotations.
I've really noticed that temperature and weather affect my mileage. The warmer it is, the better mileage I get. This is likely due to the air/fuel requirements when the density of the air changes. Yes, I can actually notice this difference, and it amounts to about 1mpg between summer and winter.
Rig setup is in my sig. Since I have re-geared to 4.88s, my odometer is pretty spot on. 80% city (under 45 mph) and 20% hwy (70-80). That high point on the graph is from driving a tank 100% hwy. I drive like a 103 year old bag lady so I have a hard time believing that someone with a built rig is getting 15 in the city.
You fill up, set trip A to zero, run to empty while only driving in the city and then tell me what your Trip A odometer says. Also, tell me how much gas you put back in on the fill. Are you just going off what your scanguage reports? I am at the end of my chain with this issue. I may just buy another one and start building again.
You fill up, run to empty and then tell me how much gas you put in the tank. Are you just going off what your scanguage reports? I am at the end of my chain with this issue. I may just buy another one and start building again.
Put a diesel in it. That will take care of all your issues with MPG's.
On the way to URE (318miles) I was cruising at 75-90mph and used 3/4's tank. On the way back I did the same and similar results. I hit Atlanta traffic and I barreled through the rest of the tank.
