Jaws1

^+1. The worst I've gotten on that drive was 13.5L/100km and that was with a 40 kmh head wind. I typically get 12.5-13, so 17 is off the charts. Definitely something wrong with your truck. Good luck, but I think you made a poor decision. The new F150s are worlds above an '06 GM.

nolagtime

This was my lifetime average last week.

I never idle, try not to speed, in fact have become somewhat of a granny driver while trying to get my economy back.

I think it was a dud, but "because it has not thrown a code" Ford tell me there was nothing wrong with it.

Just ironic though that 3 of the 4 Ecoboost 3.5L engines in my circle of friends are all getting poor economy.

2010stx4by4

What is poor economy to people ?

My 2011 5.0 is at an avg of 16.2 over the 3000 miles it has on it. I'm happy with the truck since it's a 7200 brick with a toolbox in it that weighs 175-225 pounds and 4-80 pound sandbags.

I'm carrying 500 extra pounds, I can't wait for summer I should gain at least 1.5 mpg back. Maybe , just maybe , 18.0 mpg is in my future.

Good luck with the GMC.

andyoi

So if you lost $7000 on your F150 like you said you would in the other post, and are only saving $7 per 300km (186 mi), it will take you 276,000 km (171,500 miles) to recoup your loss before you start saving a cent, this is assuming that the older truck needs no maintenance.

Sounds like a very solid investment to me...................

medicff0879

So you negate your argument with your own statement? Economy is a truck that gets the same, or better, MPG as your truck with all the BS you supposedly are carrying on it!!

Mine is AVG. 14.6 EMPTY!! That is a 5500 lb (or whatever) "brick" that is EMPTY!!! And it is getting worse MPG than your loaded up truck at 16.2 and mine is with a motor that advertised as an "ECO" motor!! THAT IS POOR ECONOMY, or is it somehow not?

My question, is the one "GOOD" thing about the ecoNothing is that when you are idiling, does it in theory use less fuel than idiling in a V8, since it has two less cyclinders? Or did all their direct injection BS f**k even that principle up as well? Just curious, can anyone offer an answer to that?

jcain

You must drive like a real asshat. I average 17 and rail on my Eco daily.

Ford850

Man I wish diesel was that close to gas prices around here. It's a minimum of 20% more year round. It's 25% - 35% more right now. I could never justify a diesel truck, but I do have diesel tractors and a lawn mower. Luckily I can time my diesel fillups since they don't use fuel steadily like my truck.
Good luck with your truck. I hope it works out better for you in the end.

mcnewskie

Ive got a 10' screw with the 4.6l 3v v8, average about 17-18 mpg on highway driving ~70mph with cruise usually on. In town, Im around 14-16 mpg (thats keeping a steady foot and flooring it only if I need to switch 5 lanes over to turn and some a**hole wont let me pass them). Was considering a new ECO engine or a new model truck in general. I may stick it out a while and see what everyone else has to say about the 12's first as there seems to be some real mixed reviews at the moment. Of course, Im not really buying a truck based on mpg's, Im buying them bc they look great and are fu*k*ng beasts. Ill get a rice burner if I wanna save on gas.

stock?

Did you really need two threads??

Good luck with your Duramax, solid trans and solid motor.

SultanGris

Indeed, LOL! Always love threads on truck forums with people complaining about gas mileage, makes me laugh, Haha!