Woolaroc

How much of a factor is this winter fuel (I'm in OK) have on the MPG. On a rcent trip from Tulsa to Kansas City I can usually get around 19mpg averaging around 65mph and in the city around 17mpg. My trip a couple days ago to KC I got 16 mpg and in the city around 14. This has been the average for the past 3 tanks.

Does the fuel cause a 3 mpg decrease, or could something else be going on. Also the air temp has dropped to avg around 35deg for my past 3 tanks this is based on.

I have and Ecoboost with 3.73 rear end and 9700k miles.

After the first tank I noticed the decrease and decided to finally use my SCT tunner, so I flashed the Stock SCT Tune and there was no change in MPG. Also I've been running 91 octane since purchase..

mcfarmall

My MPG will drop around 2.5 with winter fuel...does it every year like clockwork. Save your $$ and run regular unleaded.

klumb15

A solid 2.5-3 MPG loss for me. Partly from the fuel, partly from the cold temperature causing longer warm ups, cold/thicker fluids, etc.

TXAG07

Exactly. I'm in Texas and have been seeing about 1 mpg loss since winter. With the colder days (below 30 in the morning) it has dropped 2-3 mpg. You can watch the mileage plumment after startup. Eco with 8k miles.

Woolaroc

Well this makes me feel better!

isthatahemi

My truck gets 14mpg at 70 mph, -20 cold start in the winter. Once warmed up, it gets around 24mpg at 70 mph, again, at -20. Cold matters, and contrary to the often repeated myth, winter fuels are barely down on energy vs summer blends. I believe the difference was <3%.

mrpositraction

I have been seeing a sollid 2-3mpg loss. You have to factor in the idle time too, my trucks idles a lot in the winter.

boosted150

+1 Cold is an issue.

I think one of the biggest factors is time to operating temp on the tranny. The whole time you're less than 105 degrees F on the tranny, the torque-lock converter is not running. Once you hit 105, the torque converter engages, your RPM's will drop, and you're truck will be a lot more efficient.

At 20 degrees outside, it takes a long time to reach 105 vs a summer day starting at 80 degrees.

I hate the MPG meter, but you can watch the difference on the Real Time MPG screen.

11eco

3 mpg drop for me also

kbass24emtp

I have seen about a 2 MPG drop also.