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-   -   Gas Mileage down? - Spring is coming (https://www.greenhybrid.com/forums/f22/gas-mileage-down-spring-coming-6123/)

lkewin 02-24-2006 08:41 AM

Gas Mileage down? - Spring is coming
 
Just entered by second tank in the database and was looking at those with the top mileage....and those at the bottom. Real clear (and no suprise) that the top several cars were driven in temps around 60-70, :shade: while the lowest several list temps in the 20-30 range :cool:.

So...for those in the north, keep the faith, as spring is on the way...even if the thermometer outside is telling a diffrent story!;)

Sledge 02-24-2006 08:57 AM

Re: Gas Mileage down? - Spring is coming
 
16F this morning. Bleh.

I guess I should be happy I can maintain 45+ mpg with underinflated tires and winter gas in sub-20F weather. http://wap.srb.co.yu/forum/images/sm...n_rolleyes.gif

kenny 02-24-2006 09:09 AM

Re: Gas Mileage down? - Spring is coming
 
Why don't you guys just all move to the beach in Southern California?
We have lots of affordable housing and no traffic congestion at all.


Hahahahaha

subnivean 02-24-2006 09:55 AM

Re: Gas Mileage down? - Spring is coming
 
I've 'hypermiled' (51-52 mpg) the last couple of tanks at 25F with some really sticky ice tires (Michelin X-Ice), so I'm really looking forward to seeing what I can do with summer tires and warmer temps.

BTW, is there an 'optimum' operating temperature for the HCH? I'm hoping yes (but I think probably not) - that way I can catch up to the leaders while they're blasting their AC in 'suboptimal' heat :)

kenny 02-24-2006 10:04 AM

Re: Gas Mileage down? - Spring is coming
 
Optimal temp would be the same temp as the engine block heats up to so none of its heat is lost to the atmosphere.

Unfortunately that would be very very hot, probably way over 300 degrees F.

In practice hotter is better, unless the humans turn on the air conditioner or open the windows which will increase drag.

Frankly, when it is very hot I recommend driving naked and carry a spray bottle of water to cool yourself down.
You will get great MPG.:shade:


Originally Posted by subnivean
I've 'hypermiled' the last couple of tanks at 25F with some really sticky ice tires (Michelin X-Ice), so I'm really looking forward to seeing what I can do with summer tires and warmer temps.

BTW, is there an 'optimum' operating temperature for the HCH? I'm hoping yes (but I think probably not) - that way I can catch up to the leaders while they're blasting their AC in 'suboptimal' heat :)


subnivean 02-24-2006 10:14 AM

Re: Gas Mileage down? - Spring is coming
 

Originally Posted by kenny
Optimal temp would be the same temp as the engine block heats up to so none of its heat is lost to the atmosphere.

Yeah, I knew that - 'hope' just got the better of me :(

Hot_Georgia_2004 02-24-2006 11:12 AM

Re: Gas Mileage down? - Spring is coming
 
I haven't updated my tanks in a while out of laziness but will hopefully find the time to do so soon.
For my commutes this winter have been 30-low 40's at night and 40's to 60's day. I've been driving all freeway and been averaging around 55-56MPG. The few FAS's I get have saved me from the low 50's.

wundej 02-24-2006 01:49 PM

Re: Gas Mileage down? - Spring is coming
 

Originally Posted by kenny
Optimal temp would be the same temp as the engine block heats up to so none of its heat is lost to the atmosphere.

Also keep in mind, when it is colder out it will take your car longer to warm up. It will take longer for the ecu to have it's engine temp/battery charge variables met. So you won't be getting your autostop as soon in that cold weather either.

The problem with warmer weather is that your intake charge temp will go up, which isn't the best way to make the most efficient power. This is why you generally see a lot of the aftermarket intakes for car labeled "cold air intake" which usually means that they pull air from a cooler spot than the engine bay (usually the fender well or grill).

gumby 02-24-2006 07:53 PM

Re: Gas Mileage down? - Spring is coming
 

Originally Posted by kenny
Frankly, when it is very hot I recommend driving naked and carry a spray bottle of water to cool yourself down.
You will get great MPG.:shade:

That's how you get the GREAT MPG:)

And by drawing such attention, you are promoting the Hybrid.:P

We should ALL be so dedicated to our causes.

foo monkey 02-26-2006 07:14 PM

Re: Gas Mileage down? - Spring is coming
 
My last tank was aweful. Something like 42mpg. Cold temperatures were only part of it. I filled it up too early, so I didn't get those last 150 miles, with a low fuel load. I also, my wife had to drive it for 50 of the 350 miles, and killed the mileage.


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