fuel economy

[cypher203]

Alright here is what i have.. 03 f 250 mods are the edge juice with attitude and k and n big filter.. I was getting 19.5 on the highway with rpms around 2. on vacation i was talked into cutting off the stock muffler and cat. they were replaced with an aero diesal muffler. Was told by shop its supposed to help by flowing better and was supposed to get better mpg. I went from 19.5 mpg down to 16.6 avg.. why did this happen should i put a cat back on. would this help with back pressure and bring my milage back a little.. did notice an increase in power but not worth the loss of mpg in todays fuel prices to me.. so all you smart people what should i do

[Banshee34]

That seems very odd to drop that quickly. Just gotta ask though, were you towing? When were th fuel filters last changed? etc....

[nic0084]

sure you werent rompin around on it once you modded the exhuast...? stay out of the boost as much as possible and you will get your best fuel mileage.

[scotty2280]

is that change after one tank? theres a lot of variables in getting the exact same mileage out of every tank, it will always very!

[CHenry]

driving conditions were different probalby...head wind, cooler temps...i see 23.5 when its summer time and about 18 in winter with RPMs at 2k

[cypher203]

no towing no speeding just seventy mph there and back from fallon nv to tulsa ok. all filters were changed just prior to the trip... added diesel clean with every fill up. Just highway cruising with the cruise control on .....