Clifford08

Hey guys, So I drive a single cab 2008 4wd 8ft bed. It has 33's on it and is leveled with a few very minor other upgrades like newer mirrors and such, but that's it as far as anything that could possibly effect mpg. I bought it Last november and since day 1 was gettign 14.1-14.4mpg. That was highway and city combined.

Well i got a new job driving 33 miles each way all highway about two months ago and still, was sitting at 14.5mpg. A few weeks ago though, I filled an empty tank and was at 15.5. I thought this was weird, well keep reading.

So I drove another 200 miles and noticed that I was just under 3/4 tank instead of around 1/3 tank like usual. I filled up and was at 18.98mpg! Out of freaking no where, no driving pattern changes etc. I just let the tank run close to dry again and filled up then and was at 16 mpg, and yesterday at topping off I was at 17.5mpg.



can anyone maybe offer an explanation for this?? I'm absolutely not complaining, but it is leaving me puzzled.

techrep

iTrader: (1)

I wonder what motor your talking about...and do not tell me it's a 5.4 3V

Fbcoach

Could it be that they're switching over to summer blend with less additives and you don't have to warm the truck up as much? Not sure of location, but it's a possibility.

maxpat82

outside temp change play for a lot in engine fuel consumption

You should be very happy with a mpg increase!!

Clifford08

oh sorry i forgot, its a 4.6L

but the outside temps were 50 when i bought it, dropped to -5 for a few weeks, now is 40s.


im baffled lol

jshillin

iTrader: (1)

Were you letting it warm up for a while before? Extended idle time?

cardboard

Sounds great.
Every oil change get some Chevron Fuel system cleaner and put in your gas.
It will clean stuff and help with your fuel milage.

primalurges

Highway commute is much more efficient then stop and go. If your commute is at like 50mph you might get close to those numbers. If you're getting the fuel consumption data from edge or bulldog then those numbers are bogus.

luvf150

I had never seen anything over 14mpg on my 5.4L, LUCKY you. Wonder if airfilter was cleaned or changed that would improve else should be just the additives.

TheJcode

Ive done 18.5-18.8mpg on a few different long distance trips. 5.4L Screw 6.5'. Stock everything.

But yes, there is a decent bump in mpg when they switch to summer blend. I can't get to 16mpg or better all winter. It stays at 12-14. All summer it stays over 15mpg, short of any hauling things.