Lower MPG in warm weather.

After replying to a mile per gallon thread a while back I noticed when it gets warm outside I lose a couple miles per gallon. Just me?

 

Mine drops in hot weather as well, about 1mpg.

 

These trucks are odd when it comes to MPG, my truck gets its best in hot weather, go figure.

 

Mine gets better in the heat. I'm averaging around 21 mpg

 

It’s a 3rd gen, looking at it wrong drops mpg’s

 

Mine gets better in the heat, but that's likely due to the tires getting overinflated by the heat.

Have you considered the AC or do you run automatic AC?

 

who knows how accurate these displays are ... It all depends on how u drive it plus if u have Your AC on u will see a decrease in the summer

 

I always calculate mine by hand at the pump. I find the truck computer is actually relatively accurate. Most off I've seen is .5 MPG, but it's typically around .1 off.

 

How hot is your summer? Could be increased engine drag from the fan clutch locking up more, in addition to the drag of the A/C compressor

 

Yeah my truck is extremely accurate too, always matches within .1 or .2 after hand calculating.

 

Might have something to do with the summer blend of gas?

 

If not conscious, many tend to sit and idle with the AC running in the extreme heat, lots of idle time has a significant impact MPGs.

 

Well the pic in the OP says 119*F outside...

 

Me too.

 

My mileage generally improves with heat until it gets to the point that my a/c is always running full blast.

 

I don't notice a big difference until it gets over 110 or so. Phoenix Airport has flight delays when it pushes 120 because of the thin air.

 

Most vehicles will get better mpg in the summer, esp on the highway, because the air density is less and less fuel is used for cold start.

 

I always do better in warm weather. As mentioned above, cold weather usually decreases fuel economy for numerous reasons. I could see it decreasing in extreme heat. How hot is it where you live?

 

In this case a snorkel can help by drawing "cooler" air from higher up, away from the engine area...