Noticed a reduction in MPG over the last 3 months, at about the same time it started getting cold. Any correlation?

 

I would think it would increase mpg. I'm almost certain it increases power.

 

cold air is denser , your efi will probly adjust your air fuel mix acordingy
burning more fuel.
i need to watch mine its carbed and i dont wanna fry it

 

If anything i agree to better mileage. Race car drivers love cooler air going into the combustion chamber as it preforms better thus better mileage. but as usual, I could be wrong. In that case, worse mileage. Does this help?

 

Oil and tranny fluids are colder and thicker may affect mpg. Takes longer to warm up. My mpg on my 4x4 pickup drops from 18.2 to 17.4 in the winter. It takes it more than 2 miles before it shifts to OD.

 

Nuthin' to do with any of that!

I have a pal that is an engineer at a local oil refinery. He set me straight and I confirmed it myself.

Winter blend fuel! It will be here until the end of April.
As soon as the pumps have summer blend fuel, the mileage goes right back up!


I see the OP has Florida as his home. I'd be interested to hear why they'd need winter blend fuel down there. But I know for a fact this is the problem up here.

 

I didn't know it got cold in Florida,,,,,,,,,,,,,,

 

Our local BP refinery ships fuel all over the USA.

Winter blend fuel gives you less mileage.

By the end of April, the winter fuel is out of the pumps (some kind of rule that it has to be). My mileage goes up approx 5 mpg and I have confirmed this after he schooled me about it. Same with your cars, monitor your mileage and you'll see.

It's the fuel.

 

I always get worse gas mileage in the winter time, on my bikes, cars etc.Air is much more dense, oil companies make a special blend for the wintertime, and the ETHANOL certainly decreases mileage whether its winter or summer.I get 4mpg better when i fill up at a station that sells no ethanol gas.Its getting really hard to find any no ethanol stations around northwest Florida these days.

 

I am no scientist but I do know that despite any effects of "winter" fuel additives fuel mileage does decrease in colder weather. As previously mentioned, colder air is more dense and requires additional fuel for the proper air/fuel ratio and proper combustion. Yes, cooler air going in can increase power, denser air + more fuel = higher energy combustion. Drag racers sometimes will put ice on their intake manifold before a race which will cool the air coming in, giving them optimum power. I am sure there are others that are way smarter than me on here so maybe they'll chime in but living up in Canada everyone knows that fuel mileage suffers in cold weather, and that goes way bck before they ever had the "winter" blends of fuel. Ride safe y'all!!