My goal is to get 25+ mpg from my 99 XJ with 30 x 9.5 R15 ATs - Page 32 - JeepForum.com

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post #466 of 3300 Old 08-17-2013, 03:53 PM
Newtons3
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Lets be real. Look at what I drive. Im not looking to set any records. I just want my stuff efficient and Id like to extend my driving range. More Prius owners to piss off per tank. Thats how I measure my success, in that ratio -POPO/Tank. I know, pathetic. But everyone needs a purpose....

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post #467 of 3300 Old 08-17-2013, 09:54 PM Thread Starter
Charley3
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Way earlier in thread Mschi asked why I referred to my Napa certified mechanic.

I meant A.S.E certified. It is also a Napa certified shop, but A.S.E. is what I meant to say.

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post #468 of 3300 Old 08-17-2013, 10:04 PM Thread Starter
Charley3
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Pound for pound, I think my Buick is as effiicient as a Prius.

My dad said that regarding my full size Buick Park Ave vs my mom's Prius. He's driven both on road trips.

My Park Ave averages 34.65 mpg at 70 mph (averaging two road trips together). The Prius averages 50 mpg. But if you consider how much larger and heavier my full size Park Ave is, they have comparable efficiency. Pretty freakin awesome for a 97 full size luxury car.

Also, my Park Ave has serious acceleration and top speed. The Prius doesn't have that level of performance.

So I'd call my Buick a hypermiling success. There's still at least two more mods I am going to do to Buick. My goal is 38 mpg at 70 mph highway. When I get at least 37 mpg I'm going to call local newspaper.

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post #469 of 3300 Old 08-19-2013, 12:04 PM
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Which engine/transmission is in the Buick?
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post #470 of 3300 Old 08-19-2013, 12:07 PM
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Im going to try again. Has anyone had any experience mixing gasoline and acetone?
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post #471 of 3300 Old 08-19-2013, 02:52 PM
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When I swap my snow tires on to my subi I lose 1.5 MPGs I have experimented over a 2 year period with 2 sets of tires and winter and summer fuels. Tires make a difference.

'80 CJ 7 Laredo V-8
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post #472 of 3300 Old 08-19-2013, 04:05 PM
mschi772
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Quote:
Originally Posted by Charley3 View Post
So I'd call my Buick a hypermiling success. There's still at least two more mods I am going to do to Buick. My goal is 38 mpg at 70 mph highway. When I get at least 37 mpg I'm going to call local newspaper.
Those late 90s Buicks have some nice aerodynamics. I'm sure they're not perfect, but they do seem to cut through air quite nicely. I think you've got a good thing going with that luxury, power, and efficiency balance in a Park Ave.

Build Thread -- http://www.jeepforum.com/forum/f177/whats-chrokeese-build-thread-2525690/
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post #473 of 3300 Old 08-19-2013, 05:02 PM
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Im going to try again. Has anyone had any experience mixing gasoline and acetone?
I don't think anyone's responded to you because no one's mixed gasoline and acetone. At least, I haven't, anyway.

What would mixing the 2 do? More power? Better mileage? I have some acetone I bought at a hardware store, but I never considered putting it into my gas. What kind of ratio are we talking? Or is that your question to us?
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post #474 of 3300 Old 08-19-2013, 06:55 PM
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The rumor is that mixed at 3 oz. to 10 gal. your mileage is significantly increased. I have been a skeptic and nay-sayer for years, but on further consideration, there may be something to this. I have been known to doctor fuel in the past and I know how little it takes sometimes to see results.
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post #475 of 3300 Old 08-19-2013, 11:06 PM
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My '01 XJ used to get about 15 3/8 MPG, pretty much all the time. I put in a set of the 4 hole injectors, and my in town mileage went down to about 14. BUT, my hiway mileage went up to about 17-19. I recently re-geared from 3:55's to 3:73's. Which actually seemed to help the hiway mileage even more. I too am running 30x9.50's(Michelin LTX M/S), Also have a K&N FIPK, throttle body spacer and a JET chip. Had an MSD DIS 6 for about 5 or 6 years until it crapped out. THAT was a total waste of money. No noticeable improvement at all. Sent it back to them for repair. "No serviceable parts. Economically unrepairable". The 4 hole injectors and the FIPK made the most noticeable improvements. The TBS is just a whistle. Might help keep the deer away though. If you're looking for 25 MPG, you had better install a manual trans and some front lock-outs. If you're looking for an economy car, don't buy a Jeep.
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post #476 of 3300 Old 08-20-2013, 08:32 AM
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Originally Posted by xj2k1 View Post
My '01 XJ used to get about 15 3/8 MPG, pretty much all the time. I put in a set of the 4 hole injectors, and my in town mileage went down to about 14. BUT, my hiway mileage went up to about 17-19. I recently re-geared from 3:55's to 3:73's. Which actually seemed to help the hiway mileage even more. I too am running 30x9.50's(Michelin LTX M/S), Also have a K&N FIPK, throttle body spacer and a JET chip. Had an MSD DIS 6 for about 5 or 6 years until it crapped out. THAT was a total waste of money. No noticeable improvement at all. Sent it back to them for repair. "No serviceable parts. Economically unrepairable". The 4 hole injectors and the FIPK made the most noticeable improvements. The TBS is just a whistle. Might help keep the deer away though. If you're looking for 25 MPG, you had better install a manual trans and some front lock-outs. If you're looking for an economy car, don't buy a Jeep.
Would you happen to have a diagram of how you integrated the MSD with the coil rail?
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post #477 of 3300 Old 08-20-2013, 02:28 PM Thread Starter
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Which engine/transmission is in the Buick?
Buick 3800 Generation 2.

No ideas what transmission. It's a 4 speed auto with torque lockup.

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post #478 of 3300 Old 08-20-2013, 05:22 PM
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How is the topic of Winter vs Summer gas relevant?

You can only buy the gas available in that season.

No matter which gas, the Jeep mods still help.

So how is the blend of gas relevant when you have to buy what's available?

Am I missing something?
Go to craigslist, get a free 55gal drum (or few) fill them in the winter, use them in summer.**

**There are many do's and don'ts e.g. do not fill them up - they need expansion room. you may want to lay them on side so they can be 'stired' (or rolled)......

4-wheeling is about going where others can't won't or don't think it's safe.
Freedom. Exploring the wilderness, or nature, whatever... - NOT paying to go on someone's roller-coaster ride, or go-cart track!
"The price of freedom is eternal vigilance." - Thomas Jefferson
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post #479 of 3300 Old 08-20-2013, 06:02 PM Thread Starter
Charley3
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Those late 90s Buicks have some nice aerodynamics. I'm sure they're not perfect, but they do seem to cut through air quite nicely. I think you've got a good thing going with that luxury, power, and efficiency balance in a Park Ave.
The aerodynamics are good, and got even better when I raised rear 1". The positive 1" rake added another 2.5" to gas mileage at 70 mph. It is a sleek, good looking car.

I bought it for only $4500K with 50K miles on it. I put $2K into it mechanically fixing things (broken motor mounts, broken front electric seats, new shocks and srruts front and rear, tune up, new syn fluids) and a few $ for mods.

Best car I've ever owned. As close to perfect as it gets for the money.

Warning: I often edit my posts a few times to get them complete, or to correct errors.
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post #480 of 3300 Old 08-20-2013, 06:15 PM
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It was pretty simple. A bit of work though. I mounted the MSD under the rear seat. I cut the harness for the coil pack, and routed wires back to the unit. I then had to route them back to the engine compartment. And re-connect to the coil pack harness. I think I ended up with a bundle of almost 15-20 wires. I then wrapped the bundle with aluminum foil, and wrapped that with 22 guage bare copper wire. Which I then grounded. That acted as a shield to keep the "noise" from the wire bundle from wiping out the recieve on my ham radio. Also had to use two tach modules. And I bought their filter capacitor. About $450 when I was done. I did NOT see any improvement in performance or mileage. I wouldn't recommend it to anyone. The DIS 6 died after about 5-6 years, and MSD wouldn't repair it. I've still got the tach modules and filter cap if you're interested though.
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