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Old 02-23-2011, 09:12 PM   #31 (permalink)
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55 was chosen because thats the slowest they thought people would drive. Speed limit was 45 mph during the war.

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Old 02-23-2011, 09:12 PM   #32 (permalink)
50 mpg Fiat 500 Project
 
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Quote:
Originally Posted by Frank Lee View Post
http://ecomodder.com/forum/showthrea...peed-1477.html

There seems to be a point of lower rpms at which engines don't get more efficient.

phew, now thats getting way up into that engine cavity in the search for better mpg.

i'll bet that at a certain point, the speed in which the combustion explosion propels the piston down it's bore has an ideal.

I'd guess that's probably related to why under-square motors (greater stroke than piston bore) are more efficient at lower rpms than over-square motors (larger bore than stroke).
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Old 02-24-2011, 01:03 AM   #33 (permalink)
50 mpg Fiat 500 Project
 
Join Date: Jan 2011
Location: Temecula, CA
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'99 Ford ZX2 S/R - zonker - '99 Ford Escort ZX2 S/R
Team ZX2
90 day: 28.75 mpg (US)

'89 Dakota LB - blue - '89 Dodge Dakota V6 LE
90 day: 19.8 mpg (US)

'17 Fiat 124 - SunFiat - '17 Fiat 124 Spider Classica
90 day: 30.51 mpg (US)
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another update...

did my 90 mile loop tonight, but with lowered speeds.

92.6 miles, 50F, 50-55 mph, 2.57 gallons used.
36.03 mpg!

the previous run, same 92.6 miles, 55F, 65-70 mph, 2.90 gallons used.
31.93 mpg...

that is a 4 mpg difference between 52 mph and 67 mph. pretty substantial.
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Old 02-24-2011, 10:10 PM   #34 (permalink)
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Versa - '12 Nissan Versa Hatchback S
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Good results zonker! I found out my GP does much better in the 50 - 55 region last year. Of course it makes my 50 mile trip to and from work about 10 mins longer, but oh well, at least I am saving some money in gas. Or at least I am not burning that money uselessly.

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