Best mpg from inline 6?
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Joined: Jun 2004
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Best mpg from inline 6?
Just wanted to know what kind of gas mileage I could generally get from a 1992,standard cab, long bed inline 6 (300ci.)?
I've always had Rangers, 4cyl&6cyl and been happy with 20-25 mpg.
I had a 89 F-150 351that got all of about 11mpg,on a good day, without wind.
I didn't know if there would be much difference between the 6cyl. & 8cyl.?
Thanks for any info.
Ol' Ranger
I've always had Rangers, 4cyl&6cyl and been happy with 20-25 mpg.
I had a 89 F-150 351that got all of about 11mpg,on a good day, without wind.
I didn't know if there would be much difference between the 6cyl. & 8cyl.?
Thanks for any info.
Ol' Ranger
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This will depend greatly on the gearing, tranny and skinny pedal treatment. I have an '89 F150 4spd, 300, 3.08, 4x4. It gets an easy 17+ around town and through the country side - with moderate applications of acceleration. I also have an '89 F350 C6, 7.3 diesel, 3.55, 2wd. It gets around 16+. It doesn't matter if I go 35 or 65, empty of towing 10k pounds. Your 300 is just one variable in the greater formula. Most of these vehicles (when in proper tune) are good for mid to high teens. IMHO. 
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I've never seen a common MPG # for 300s. I've seen them greatly vary, even for stock motors. For instance, my motor is all stock except for my exhaust. With 32" tires, 4.10s, and M5OD manual overdrive transmission, I'm averaging 7-8mpg mixed highway/city taking it easy on the pedal. When it had 31" tires, stock 3.08 gears, stock exhaust and same transmission, I think the best mileage I got was 12mpg, also mixed highway/city. You just can't tell with these motors.
Last edited by Project Lazarus; Feb 1, 2005 at 10:14 PM.
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I have a 1990 with 3" Gibson exaust a high flow cat, tb spacer and a K&N air filter and 33" tires with a stock rear and im getting 16-17 on the highway and 10-12 in the city. I guess for what i have on it im doing ok?
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Joined: Dec 2004
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From: Churchville MD Harford co
Im running a 77 supercab 4x4 4.10 gear 35" tire 4 speed with a 4barrel and split exhaust manifolds 10-15 MPG and thats usually pounding it!!!
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Post Fiend
Joined: Mar 2004
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From: San Francisco, Ca.
I USED to average 20 mpg highway, with 23 being the best I got with a 1981 F150, 4.9L, T-18 trans, 2:75 rear end ratio and 215-75R15 maypop tires. I said used to. Now it's more like 17-18 hiway. That's because I changed the ratio to 3:50, put on a set Michelin tires (9.50 R15) on American Mag 10 spoke Vectors. Also threw in an Advanced Adapters Ranger Torq Splitter (27% o.d.). You can say my truck has 8 foward and 2 reverse speeds.
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Elder User
Joined: Jul 2004
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From: Toronto, ON
Originally Posted by wickymustang
My 95 shortbox regular cab, with the M5OD and 3.55 rear gets 20 or a little better (24 or so) on the highway and about 14-16 in town. That is with a bug deflector, moon visor, and open box.
(It hasn't arrived yet - shipped from KY!)
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Joined: Sep 2004
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From: P-Town, CA
Originally Posted by wickymustang
My 95 shortbox regular cab, with the M5OD and 3.55 rear gets 20 or a little better (24 or so) on the highway and about 14-16 in town. That is with a bug deflector, moon visor, and open box.
How does that work??? MY bro had a '96 with no added wind resistance. 100% stock w/K&N filter and he gets 17 at best with recent tune-up and synthetic oil. He has the M5OD and 3.55 with 70/30 HWY/city mix.
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Generally I shift at 2k, sometimes higher if I need to get moving in a hurry. I have a catback exhaust, paper air filter, tune up with plugs/wires/rotor/cap, castrol syntec blend oil, QS synthetic ATF, fresh gear oil in the rear end. I don't floor it to start off and I shift smart according to conidtions. Learned to drive stick from my dad, retired long haul trucker and have done a little semi driving myself.
