Fuel Mileage Survey: Discovery

[Militant-Grunt]

Hey guys, im conducting a scientific experiment for a major project on how many miles does a person get on 87 octane/ 89/ 91/93/94. On a full gas tank from Full to Reserve light, how many miles do you get on what type of fuel.

[Quicksilva]

premium 75mph on cruise control...thats with a 12000 winch...arb and tjm bumpers...SD roof rack...6 aux light....dual batteries and 235x85x16 tires...

Marcus

[Disco]

I presume you are going to do this with the same vehicle?

[Militant-Grunt]

Originally Posted by Disco

I presume you are going to do this with the same vehicle?

well yeah. I should have mentioned. I want to keep it to people with the 3.9L/ 4.0L engine ( basically the same thing.. ) so the differences should be minor, I need as many people posting their amount of miles as possible, so that I can compile the data into a graph.

PLEASE help out, I greatly appreciate all the help i can get.

[01001010]

Cool BEANS...I'll reset my clock tomorrow and fill'er up...should have the light turnin on by Tues.

[Disco]

Too many variables. To be exact, which the end result should be, you need to do this with a same vehicle and fill the same amount each time. Other people have different driving habits, and their vehicles are different; some well tuned, some not. There is all weight differences to take into account; how often during the experiment they used cruise control (it does save fuel) during highway driving or not. Whether they have the correct tire pressures and speed variables, just to name a few. If you do your experiment the way you envisage, I don't think it will tell us anything useful. Sorry if I sould like a naysayer.

[Militant-Grunt]

Originally Posted by Disco

Too many variables. To be exact, which the end result should be, you need to do this with a same vehicle and fill the same amount each time. Other people have different driving habits, and their vehicles are different; some well tuned, some not. There is all weight differences to take into account; how often during the experiment they used cruise control (it does save fuel) during highway driving or not. Whether they have the correct tire pressures and speed variables, just to name a few. If you do your experiment the way you envisage, I don't think it will tell us anything useful. Sorry if I sould like a naysayer.

Well... true, but those would really just account for a few miles in difference nothing huge. Lead foot especially. Disco I know exactly what you mean, but for my needs I just need more or less estimates, thanks for the input tho, it is helpful. Still post away.

[Serg]

I get about 14.5-15.5 MPG average.. and I drive up and down a mountain road 4 days a week and in town most of the rest of the week.


Serg

[roverX]

I get about 300 miles out of a tank of premium. I have a 2 inch OME lift with 265/75/16 MT's. My city mileage sucks but freeway is decent. I am running Hwy 4 to Angels Camp 2 - 3 days per week so there is some mountain/hill driving (onroad) too. My truck is a 96 D1 SE7 with a 4.0. I also am using the K&N air filter, Bosch platinum +4 plugs, magnecore wires, and only a cherry bomb behind the cats (yes, it passes CA smog!).

[montaggio]

One thing to bear in mind is to verify the octane levels. They are sometimes reported on the pumps as:

RON - Research octane number - always the highest number
MON - Motor octane number
R+M/2 - The average of reseach and motor octane numbers

In Canada, you will see a small sticker at the pump that says they report (R+M)/2 for the purposes of advertising octane numbers. Not sure what is used in different states or different parts of the world.

So, a 91 octane and a 93 octane may be exactly the same if 91 is the MON and 93 is the RON. R+M/2 is still 92, but reporting the RON makes for better advertising!

[02disco2]

91 octane, roughly 300 miles to the tank (or 24 gallons on the fill up) That works out to roughly 12.5 MPG. If I am towing my boat, I can get 220 out of a tank of 91 octane, or 9.166 MPG.

Happy reporting.

[cdr146]

302 miles out of 20.25 gallons. Thats 14.9 miles/gallon. That was about 150 miles of stop and start driving (using D3 where possible), and about 150 on the highway at 70 mph, cruise control.

[BIRD]

I will have to agree with Disco. Ther are to many variables. I have an 04 Disco with the 4.6 eng. I drive a very constant speed and route. I get about 330 miles to 20 gallons. As for putting the truck in 3rd gear in trafic. I still have not seen much or any improvement on millage. If you are in heavy. I just say to keep the truck in drive and keep the RPM's below 2000 RPM and you do not have to put any extra stress on your trany. That is my two cents

[PCrover]

I was getting aroud 12-13mpg with an '03 disco and a heavy foot. As high as 15mpg with just freeway driving. I now have a '95 Disco 5-speed and get around 15mpg combined driving.

[LRR219]

92 3.9 County 180-210 Miles Per Tank, Not So Good...