gas mileage
#5
#6
Originally Posted by lougil
I have a F 350 4x4 5.4 super cab it has a flowmaster exhaust I get about 10-11 mpg would a KN air filter give me better gas mileage?
Quick answer: NO.
First...you do not mention what year SD you have?
Stock size tires?
What gears you running?
How many miles on your SD?
Is that 10-11mpg in city or highway driving?
Have you done all the scheduled maintenance???
Keeping your 5.4L in top running condition...and an easy foot will yield the best for mpg.
biz
#7
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#8
I never notices a difference running one either. The whole intake system might make a difference but you're talking some bucks then. Not many upgrades are going to give you a significant jump in fuel economy. My problem is I see them as 'performance upgrades' not fuel economy upgrades. More horses means you can put your foot into it more often right?
#10
#11
when i bought my truck .... the first tank of gas prob 87 octane ... i got 11 mpg.. mixed driving.....
after that i had a super chips programer and a K&N full cold air intake, and Aero turbine exhaust system (no cat) ..... eventually added a topper, fender flares .... and now finally a functional ram-air hood intake.......(among other things that that dont really effect mpg other then maybe weight?) ......
so after all that ...i still only average 13 mpg ..... with my mixed driving
during the winter ive dropped to about 12.5
i havn't tried it on a long trip all hwy yet (since the ram air) to see how that does.... i dont seem to take long trips with just the truck very often .. as i'm usually towing on long trips...
and yes.... im glad i did all that stuff ... as the truck "feels" so much better....
.....really....... there isnt alot u can do about mpg other then driving habits IMO...
after that i had a super chips programer and a K&N full cold air intake, and Aero turbine exhaust system (no cat) ..... eventually added a topper, fender flares .... and now finally a functional ram-air hood intake.......(among other things that that dont really effect mpg other then maybe weight?) ......
so after all that ...i still only average 13 mpg ..... with my mixed driving
during the winter ive dropped to about 12.5
i havn't tried it on a long trip all hwy yet (since the ram air) to see how that does.... i dont seem to take long trips with just the truck very often .. as i'm usually towing on long trips...
and yes.... im glad i did all that stuff ... as the truck "feels" so much better....
.....really....... there isnt alot u can do about mpg other then driving habits IMO...
#12
#13
I think you might have hit the nail on the head there. Nothing against the 5.4 guys but my simple logic says a bigger motor takes the same or less fuel to move a big truck than a smaller motor working harder to do the same. Yes I realize there are tons of factors like driving habit, gears, weight, etc. but that's my thought.
#14
Originally Posted by lougil
I will add a KN air filter hoping to get better gas mileage.
biz
#15
i have a 2000 CC 4x4 shortbed 5.4 auto 3.73's, dual exhaust all the way back, no cats, 40 series flowmasters, and i just put a K&N in and made a 600 mile trip the next day, with my speedo showing 80mph with my 305's it ended up at 14.9mpg which im sure is really better, what I could tell the most was my truck took a little longer to downshift going up hills and might not downshift on every little uphill bump in the road i came across.