whats up boys and gals. i was wondering, what could be the reason for a recent dramatic increase in gas usage? seems im going through alot more fuel lately and seems that it happened over night and not gradualy. fuel filter or cause its been -25c - -32c the last few days? thanks

Jimi

 

There's about 25 recent threads on this topic. Just look around or search.

 

Mine started drinkin more when it got cold. Of course that means I dont drive around as much anymore!

 

Cold weather. Mine was getting 17-19 miles per gallon when the weather was warm. I am at 12-14 right now. When the weather warms up your milage will return.

 

The formula for gas changes between winter and summer. Check out the EPA web site. EPA.gov ?

 

1. The winter fuel blend is different from the summer fuel blend.

2. Cold air is also denser. You're still taking in the same volume but the air is more dense requiring you to use more fuel to keep a proper a/f ratio.

 

youd drink more if it was colder outside too.

 

normally the gas companies change the formula of the gas when the temp drops to save petrolium. im certain thats probably what it is

 

Air density is a factor, but it has more to do with the truck's ability to move through the air than it does breathing it in.

IIRC, Summer fuel is less efficient because of smog control methods in the formula.

It has more to do with other factors, however. When it's cold outside, you're running your heater and losing a lot of the engine's heat to the outside air, reducing efficiency. This is the same reason your truck has a thermostat: to stay warm. Engines have a peak operating efficiency temp and cold weather reduces it.

In cold weather, you also spend more time at 0mpg: warming up. How many of you leave your truck idling more in the morning to warm up?

Then there's rolling resistance. Driving through snow is harder than dry, bare ground. Another factor is tire inflation. How many of you remember to inflate your tires more in the winter? The colder weather reduces the tire pressure in your tires, increasing rolling resistance.

Oh well, I enjoy "winter." Mainly because I'm in San Diego...