What has happened my mpg has dropped to 11 ,,It was getting avg 18.3 ,,any ideas ,,,, 4:0 motor automatic excab 4 door ,,old man drives so not much for lead foot ,,,Thank you for any help,,,

 

When was the last time a tune up was done? Check your air filter, change fuel filter, spark plugs, wires, etc if they haven't been done in a while.

 

I didn't mention it has low miles on it 29k ,,would it need a tune up ?

 

Shouldn't need plugs and wires, but check the air filter, and swap out the fuel filter. Both cheap and easy to do, worth a shot.

 

It has new air filter ,,done last oil change,,,Could it be the oil change ,,switching from mobile 1 full syn to quaker state blend
That's about the time the mpg dropped ...Thank you for your help

 

Why would you downgrade from Mobil 1?

 

Speedy lube didn't have it,, Got the next best think I thought ,,was I a hurry going on trip next morning,, With 8 inches of snow ,I wasn't going to change myself ...

 

If you can't even change your own oil, I'd suggest taking your truck to a shop and have them find the problem.

Different oil brands won't drop your mpg. Jiffy ***** probably fucked something up.

 

I wouldn't put it past the shop to mess something up, intentionally or not, and you end up having to go back to spend more money.

I would still check the air filter, fuel filter is cheap and easy to do, clean MAF, check your plugs, they may be fouled up.

 

Ok thank you ,,Will get my neighbor to help me ,,I had a bad accident a few years ago and don't get around very good ,,been disabled since 2004 ,,
I help neighbor he helps me ,,He got MS at 33 ,,We both fight against our disability's ,,Don't let stuff get us down ,,You never know who your helping ,,Thank you Robert

 

Good luck. Do some searching on here for old threads, how-to threads, and maybe buy a repair manual for your truck so you can handle the easier stuff. Save you a little bit of money. Hopefully it's something simple.

 

Thank you,, for the help, Neighbor on search too ,,Maybe some stuff on you tube might help he says ,,,Thanks again ,,, next oil change back to mobile 1 for this rig ,,It sucks my 06 f-150 gets better mpg than my 11 ranger

 

That is a huge drop. I would think you would experience a drivability issue.

 

I haven't noticed any power lose ,,It still scoots when throttle is applied ,I wonder if the could be a vacuum leak as ,One older search thread said something about the ac compressor kicking in when it shouldn't ,,But I haven't seen any fixes yet,,

 

your gas may have changed.

NY used to do this, we had summer gas (pure gas) and winter gas (10% ethenol)

problem is winter gas is a 10% mileage hit.

Now that NY just got rid of summer gas all together, we never regained that 10% ever again and people forgot/ dont care

 

He went from 18 to 11. Its not gas.