im not completely sure about these motors but if they are not I wouldnt mess with it.

 

My bad dude.... I meant 89oct fuel.... damn fumble fingers =)

 

yeah well i don't know how yall are pulling 18.8 MPG outa your dakotas...mine gets 15 16 mpg. but when i'm driving like a Jackass I get like 13.5...I've got an Intake and Catback exhaust...and Fastman TB on the way. What do yall have to get better MPG?

 

I think you might have just answered your own question. =)

 

Mine doesn't get much better either...but I do like to hear my exhaust in high rpms....

Does this pulley go to the alternator? If it does I'd be hesitant to put a pulley on...just because I need as many amps I can get out of it. Especially, if I get an electric fan on and add some more lights...but HIDs should use less amps right? That could help balance maybe.

 

I honestly have to grandpa the hell out of it in order to get the 18-19 range. Normally i'm about 17 all around though.

 

when I cruse on the turnpike about 65mph I can get into the 22-24mpg range, and when I take it easy I can get 14-16 city

 

how the hell do you pull that off? you have bigger rims and average 22-24? am i missing something here? even when i baby my truck the most i got was 18.3mpg. what modifications do you have to be getting 22-24 mpg? and when i took my truck to NC and back I did 70 the whole way and got 19.5... do you have the HO motor? and do you guys with HO motors get better gas mileage than non HO?

 

Well he's 4x2 so you should expect him to get better mileage than yours.

 

ANOTHER MILEAGE DEBATE??? SHOCKING! SHOCK-ING!

T-Bird has 4x2...could that be it? Bigger wheels actually drop highway RPM, usually good for mileage...Maybe he has cleaner air filter and better lubricants...better fuel? Different air temperature? Maybe he's charged his frame rails and tires with helium! Different trans? Different PCM habits, could be a bazillion things! You get what you get, and unless something is making a horrid noise or blowing out weird smoke, it's probably normal! Normal variation! Sometimes I get 18 on a tank, sometimes 21! Maybe it's the phase of the moon

Never has there been better proof of "Mileage May Vary!" than this forum. Either everyone is bull****ting their mileage, or the universe is still functioning properly and there is normal variation from vehicle to vehicle!

GAAAA!

OK im done.

Anyway, to get the thread back on track, a $285 underdrive pulley makes me want to buy a lathe and get into the underdrive pulley business.