Less miles per gallon, the hotter it gets

[schifty]

Is it just me or do others seam to get less gas mileage, the hotter it gets? Reading 116 on spyder dash in Fort Worth Texas riding F3

 

[Pampurrs]

Is it just me or do others seam to get less gas mileage, the hotter it gets? Reading 116 on spyder dash in Fort Worth Texas riding F3

I've been getting the same 35 MPG since I picked up my RT in June. It was in the 80s and 90s then, and now in August it's typically 118 or so. I'll see if there is any improvement in the winter months.:dontknow:

Pam

 

[schifty]

Was getting around 250 miles per tank, dropped to 210

 

[Bfromla]

E-free

http://pure-gas.org/index.jsp? I also use gas cubby app to help keep track. Iv seen big drop when i get a mix of ethonal. Heat or on trip.

 

[Bob Denman]

Usually; the reverse is true... :dontknow:
The Reason:
Fuel injected engines are tuned for a particular fuel mixture ratio.
If it is colder outside; the air is denser. In order to make the mixture right; the injectors will add more fuel to the mix.
Conversely, when it's hotter; the air is thinner. Less fuel is needed to make the mix right! :thumbup:

Could it be that your right wrist is just getting too friendly with the loud grip?

 

[Sarge707]

Usually; the reverse is true... :dontknow:
The Reason:
Fuel injected engines are tuned for a particular fuel mixture ratio.
If it is colder outside; the air is denser. In order to make the mixture right; the injectors will add more fuel to the mix.
Conversely, when it's hotter; the air is thinner. Less fuel is needed to make the mix right! :thumbup:

Could it be that your right wrist is just getting too friendly with the loud grip?

Any Pilot will tell you-
Cooler, Dryer= More engine performance and Gas Consumption!
Hot, and Humid Dense air= Less Engine performance and Less fuel consumption!

 

[jwulf74]

Gas is probably escaping through the vent at a higher rate due to the higher temps... just a thought...probably wrong, but I can watch it pour out of my vent...

 

[SpyderAnn01]

Here's another thought, maybe you are not getting as much gas into the tank when you fill up and it is hot outside. So if you are putting in less gas you would go fewer miles per tank but not necessarily fewer miles per gallon.

 

[Pampurrs]

Here's another thought, maybe you are not getting as much gas into the tank when you fill up and it is hot outside. So if you are putting in less gas you would go fewer miles per tank but not necessarily fewer miles per gallon.

That theory would apply if you were using a tank of gas as the denominator. That's a very inaccurate method. Most people (myself included) track how many gallons are replaced into the tank at each fillup, and divide that into the miles ridden between fillups.

Pam

 

[BajaRon]

If you are not using premium fuel (92+ octane) in hot weather, then your computer is very likely retarding ignition timing to prevent knock or pre-ignition. This will reduce your MPG noticeably because you're not running efficiently.

Ethanol fuel is not your friend either. That will cost you about 10% in fuel mileage and power as well.

 

[Pampurrs]

If you are not using premium fuel (92+ octane) in hot weather, then your computer is very likely retarding ignition timing to prevent knock or pre-ignition. This will reduce your MPG noticeably because you're not running efficiently.

Ethanol fuel is not your friend either. That will cost you about 10% in fuel mileage and power as well.

I certainly hope nobody is actually using regular unleaded in their Spyder :yikes:

Pam

 

[PaladinLV]

+1

Try filling up in early morning or later at night.

AJ

Here's another thought, maybe you are not getting as much gas into the tank when you fill up and it is hot outside. So if you are putting in less gas you would go fewer miles per tank but not necessarily fewer miles per gallon.

 

[SpyderAnn01]

Was getting around 250 miles per tank, dropped to 210

Here's another thought, maybe you are not getting as much gas into the tank when you fill up and it is hot outside. So if you are putting in less gas you would go fewer miles per tank but not necessarily fewer miles per gallon.

That theory would apply if you were using a tank of gas as the denominator. That's a very inaccurate method. Most people (myself included) track how many gallons are replaced into the tank at each fillup, and divide that into the miles ridden between fillups.

Pam

That is how I measure my mileage also but the OP doesn't do it that way.

 

[SpyderAnn01]

I certainly hope nobody is actually using regular unleaded in their Spyder :yikes:

Pam

In northern British Columbia and the Yukon Territory regular unleaded was the only thing available. All of our Spyders ran just fine on it and we were quite happy to have it.

 

[Gray Ghost]

I certainly hope nobody is actually using regular unleaded in their Spyder :yikes:

Pam

Ethanol is crap. It adds octane numbers, but deteriorates quickly. If any water is present, and it will be from condensation, etc., ethanol will separate from the gasoline and combine with the water. In our shop a good deal of our workload comes from vehicles that have been sitting for awhile with ethanol gas in the system.

The website pure-gas.org lists places you can buy non-ethanol gas by state. They also have an app that you can use when you are on the road. I use the non-ethanol any time I get a chance and have never had an issue with it.

 

[joebryanjr]

A couple of possobilities:
Depending on where you live "reformulated gasoline" for warmer temperatures yields less MPG.
cooler air is more dense and requires less fuel to fill the cylinder, though most modern engines adapt to that somewhat.

 

[Bob Denman]

A couple of possobilities:
Depending on where you live "reformulated gasoline" for warmer temperatures yields less MPG.
cooler air is more dense and requires less fuel to fill the cylinder, though most modern engines adapt to that somewhat.

Joel,
If you're getting that cooler, denser air; you need MORE fuel to keep the mixture right... :thumbup:

Cooler weather: more fuel
Hotter weather: less fuel

(Old time two-stroke tuner here...)