My MPG :(
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
My MPG :(
Just calculated my MPG and its 5.89 on a mix of premium and mid grade. I fill the tank one day with premium then when it gets to half a tank i get mid grade then next half tank i get premium again. Figure get a little higher octane going cuz it runs like crap on regular.
Anyway, i really cant keep going with this mpg if i can help it. I just got new dual exhaust with a X pipe. Its 2.5" into the X and into the mufflers then a short run of 3" out before the rear wheels.
What can i do to get better MPG with what i have. I have a 1974 F250 4X4 390, mild cam (mild lope to it), Holley double pumper 4BBL carb, D60 with 4.09 rear, and D44 front (discs), 35" tires.
I know, not the ideal set up for MPG right? lol Anyway i really like my carb and i was told that my exaust smells a little rich so i should have the truck jetted and dynoed and was told due to that i should get better MPG. Is there anything else i can do like better spark plugs, better distributer (im thinking MSD), etc?
Thanks
Anyway, i really cant keep going with this mpg if i can help it. I just got new dual exhaust with a X pipe. Its 2.5" into the X and into the mufflers then a short run of 3" out before the rear wheels.
What can i do to get better MPG with what i have. I have a 1974 F250 4X4 390, mild cam (mild lope to it), Holley double pumper 4BBL carb, D60 with 4.09 rear, and D44 front (discs), 35" tires.
I know, not the ideal set up for MPG right? lol Anyway i really like my carb and i was told that my exaust smells a little rich so i should have the truck jetted and dynoed and was told due to that i should get better MPG. Is there anything else i can do like better spark plugs, better distributer (im thinking MSD), etc?
Thanks
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Well, fall out of love with that carb and go with vacuum secondaries. Plus, your area has alot of hills and dales so that doesn't help matter with a heavy rig, a generally inefficient engine, and four carb jets pumping fuel all the time.
Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
*sigh* yea probably.... have a NIB edelbrock carb in the garage. Leme see what model it is and maybe it will fit.
EDIT : Its a edelbrock 1405
Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Haha what do you get?
AND ANOTHER QUESTION FOR YALL! Best spark plugs for a 390?
EDIT: http://www.summitracing.com/parts/fr...view/make/ford these any good?
AND ANOTHER QUESTION FOR YALL! Best spark plugs for a 390?
EDIT: http://www.summitracing.com/parts/fr...view/make/ford these any good?
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Swap in that edelbrock. That double pumper is pumping money right out of your wallet.
I hope you aren't expecting anything better than about 8 city. A 390 4x4 with 35's is never going to get good mileage.
I'd comment on your using premium fuel in your truck, but that's only going to lead to useless, uninformed debate.
What the engine was designed to be used with: copper core plugs. Don't waste your money.
I hope you aren't expecting anything better than about 8 city. A 390 4x4 with 35's is never going to get good mileage.
I'd comment on your using premium fuel in your truck, but that's only going to lead to useless, uninformed debate.
What the engine was designed to be used with: copper core plugs. Don't waste your money.
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Fleet Mechanic
Joined: Jun 2011
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From: Southern California
[quote=devino246;12477630]Swap in that edelbrock. That double pumper is pumping money right out of your wallet.
I hope you aren't expecting anything better than about 8 city. A 390 4x4 with 35's is never going to get good mileage.
I'd comment on your using premium fuel in your truck, but that's only going to lead to useless, uninformed debate.
Haha yea im trying to get away from premium cuz i hear it makes no more difference then midgrade yet it drains the wallet faster. And if i was to get a carb with an autochoke, which edelbrock would i go for?
And yea id like to get 10mpg out of it :/
I hope you aren't expecting anything better than about 8 city. A 390 4x4 with 35's is never going to get good mileage.
I'd comment on your using premium fuel in your truck, but that's only going to lead to useless, uninformed debate.
Haha yea im trying to get away from premium cuz i hear it makes no more difference then midgrade yet it drains the wallet faster. And if i was to get a carb with an autochoke, which edelbrock would i go for?
And yea id like to get 10mpg out of it :/
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Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Hm alright. Thanks HIO! My mechanic friend is going to pick me one up that is no where near as expensive so yea id rather save the money if it aint going to do anything.
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
I'm not an Edelbrock guy...
Is that 10 city, highway, or combined?
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Whats fuel stabilizer? And um like 8 combined 10 highway at least.
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California