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Old March 7th, 2013, 06:41 AM   #1
rubiconwrangler
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Default Whats your gas mileage on your 350?

Whats the average gas mileage everyone is gettin with a 350 in a full size truck or jeep, with 3 speed trans.


Reason I ask is im guessin what i have will get similar. I have a TJ with 350 bored .40 over, i believe stock cam, 305 heads, edelbrock 4 barrel carb either 600 or 650 i forget at this point, TH350, 4.10 gears and 33" tires, tryin to decide to D.D. it or keep letting it sit and drive a few times a year because i dont have the time to take it out offroading much anymore. It gets pricey to insure 3 vehicles for 9 months out of the year, i would like to cut one out of the equasion.
I cant check my gas mileage at this exact moment, speedo is way off and i tried to top off the tank today and found out the filler neck dumped a bunch of gas to the ground from the top of the tank as soon as it filled all the way.

Doing 70mph (according to gps) tach is at 3200 rpm, Am considering changing axles to a 3.55 or something to lower my rpms a bit.


Is it pratical to get 13 to 15mpg if i drive it nicely?

Whats your combo of everything (gearing, tire size, and trans, whats done to the motor?)
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Old March 7th, 2013, 06:57 AM   #2
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A good tune, solid engine, 3.55 or lower gears (depending on tire size), and a light foot will get mileage in this range. Fuel injection is also a big benefit.
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Old March 7th, 2013, 06:58 AM   #3
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You can get that if your nice to it. 70 mph on a 3 speed starts to use a lot of fuel. 65 is wwwaaayyy better for gas mileage
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Old March 7th, 2013, 07:24 AM   #4
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Quote:
Originally Posted by Nuggets View Post
A good tune, solid engine, 3.55 or lower gears (depending on tire size), and a light foot will get mileage in this range. Fuel injection is also a big benefit.
Well i shure hope the engine is solid and tuning is good. (well atleast i think soo and everyone else does.)
I have a MSD box im waiting to put on there also, i just haft to buy a new distributor, coil, plugs, and wires first.. Im guessin that wont hurt me though.

Obviousley i know if i step on it ill be just pouring gas away, but thats beside the point.
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Old March 7th, 2013, 07:30 AM   #5
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You can get that if your nice to it. 70 mph on a 3 speed starts to use a lot of fuel. 65 is wwwaaayyy better for gas mileage
yeah i know that will help also. and well ill try, just it hard letting little smart cars and semi trucks pass me...

right now im kinda just lookin for a base average. obviousley if dropping 5mph will help me durastically i will, but im coming from cruse-control always set at 78 to 79 in the left lane down to 70 in the right lane its pretty rough.
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Old March 7th, 2013, 07:32 AM   #6
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And fuel injected would be nice but the few grand im selling the grand am for, all going into fuel injection kit, kinda dont want to do that.
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Old March 14th, 2013, 03:33 AM   #7
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Helps if you have a properly adjusted vacuum distributor, and like always with any vehicle, brakes are the enemy of fuel mileage. Depending on what lift and also what air/fuel ratio its running at, its no problem to get 15-18 mpg. Lots of factors just than these also. Give it a try
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Old July 10th, 2013, 03:02 PM   #8
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If anyone was curious.
I now have a mildly built 350, bored .060 over, mild cam, heads milled and bored. 3.55 gears.

Speedometer is way off so I can't go by that. But when I went to the dunes, I was pulling a small trailer with a quad on it and got 12mpg doing 70 - 75 all the way. (Used GPS to track miles)

Around town it ain't worth checking considering I don't have a light foot. But freeway it does reasonable.
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Old July 10th, 2013, 04:56 PM   #9
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I'm guessing low teens on my XJ. 305, 4:10's and 32's. Speedo is real close but never bothered to check mileage. It's not a Metro.
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