Mpg Sucks-- @#$

[Vrabel]

can any one give me some suggestions i have new wires i was going to replace my older plugs and see but dont think thats whats giving me such bad MPG I have a 1992 with 4" ruff country and dunlop 33" tires I only get 200 miles to the 18 gallon tank with my axle code 41 i think that i have 327 gears it isnt the greatest but i dont dog it i stay under 3000 rpms all the time and steddy acceloration around 2000 to 2500 rpms 60mpr im at 1500-1800 depending on the grade.. so I dont think it sould be so crappy MPG does any one have any suggestions i plan on changing up to 373 or 410's in the future when the budget is right>

Thanks for all your help!!

 

[aldive]

Your gearing is a major contributing factor for your less than stellar, even normal gas mileage.

 

[Jason94sport]

Yeah 33's & 3.27's are not good for gas.

 

[Vrabel]

so i guess with an automatic 410s would be good with some off road and daily driver and highway trips ??

 

[Blee1099]

A lifted 1st gen on 33s won't get impressive gas mileage.. 11 MPG for a 1st gen lifted is actually quite normal.. If you re-gear your gas mileage will get worse.. Here's a good chart to explain it.. Dead Link Removed

 

[aldive]

. If you re-gear your gas mileage will get worse.. [/url]

I question that.

 

[Blee1099]

You can question it all you want
The way I see it, if you truck is doing say 2500 RPMs @ 65 MPH with 3.73s, a increase in gears to 4.10 will raise the RPMs. I'm sure someone who has a 1st gen with 3.73s on 33s can post their numbers and 1st gen with 4.10 or 4.56 with 33s can also post their numbers. I noticed when my truck had 3.73s and 33s, I was averaging 15 MPG but I wasn't heavy on the pedal, I had to change my driving habits alot. Changing driving habits definately can change your mileage average.

 

[aldive]

You can question it all you want .

And I shall.

 

[BMXunleashed]

uumm re gearing shouldnt make your milage worse if you gear to get your truck back on factory specs. 31's and 3.73 gearing is very close to factory specs and 33's with 4.10 gears is very close also so you should sit at around 2500rpms at highway speeds (probably a little higher with 33's) just like a stock explorer will do...so 4.10's and 33's will be good for around town which is most likely where all your gas is going because the engine has to work soooooo much harder to get your truck going from a stop then going again the having to stop, then going again....

most people "over gear" because it takes more engine revolutions to spin the tire once, sure it might eat a little more gas with the higher revs but it gets you into your power band a lot easier so you get a better performance aspect out of your drivetrain/engine. this is where people do 4.56 with 33's or 4.10 with 31's etc.... over gearing still wont eat nearly as much gas as having it under geared. gears will save your tranny from heating up also

hope this helps

 

[DeRocha]

You can question it all you want
The way I see it, if you truck is doing say 2500 RPMs @ 65 MPH with 3.73s, a increase in gears to 4.10 will raise the RPMs. I'm sure someone who has a 1st gen with 3.73s on 33s can post their numbers and 1st gen with 4.10 or 4.56 with 33s can also post their numbers. I noticed when my truck had 3.73s and 33s, I was averaging 15 MPG but I wasn't heavy on the pedal, I had to change my driving habits alot. Changing driving habits definately can change your mileage average.

Ben the above rpm # are true, but the big piece your missing is POWER. With 3.73s you can get away with it, but not with 3.27s. I ran my lifted X 33x12.5 w/3.27s for several months before stepping up to 4.10s... With 3.27s I would creep up to 65mph and get better mpg compared to lower gearing (4.10-4.56s), but only provided I was on a flat road. With 3.27s the slightest hill in the road would instantly labor the engine and require me to almost floor the gas to maintain 65mph... So any gas savings on flat roads was certainly eaten up by the increase consumption on hilly roads or getting up to speed from a start..