Register to reply 
Chevy Volt's 230 mpg ? 
Share this thread: 
#55
Aug1309, 07:59 PM

PF Gold
P: 3,081




#56
Aug1309, 08:05 PM

PF Gold
P: 3,081

It occurs to me that GM knows full well their recent release of the '230 mpg' figure would be controversial, confusing, and would be challenged. I also believe that's exactly what they want. They need people to start talking about this car, to get this very new thing into the daily discussion. We've been obliging them nicely. More than a few people will try out controversial new things, but very few people will try out something they've little or never heard of.



#57
Aug1409, 06:37 PM

P: 410

KM 


#58
Aug1409, 06:39 PM

P: 410

KM 


#59
Aug1409, 07:44 PM

P: 410

Just to hint at how confusing the equivalent mileage can be, if both battery and gasoline economies are combined, I've figured a few examples. The only quickandeasy cases are those of runs of under forty (40) miles, for which cases, the economy will always be 230 (equivalent)MPG. Once the travel goes over 40 miles (approximately), the MPG gets incrementally lower.
Take, for example, a travel of 50 miles from start (full charge): For the first 40 miles, we get: 40 Mi/230 MPG = 0.1739 Gal (equivalent) For the next 10 miles, we get: 10 M/50 MPG = 0.2 Gal For the full 50 miles: 50 M/0.3739 Gal = 133.7 MPG For a 60 mile run from start: 60M / .5739 Gal = 104.5 MPG For a 90 mile run from start: 90M / 1.1739 Gal = 76.6 MPG For a 240 mile run from start: 240M / 4.1739 Gal = 57.5 MPG I hope this gives some idea of what to expect from the Volt. Obviously unless you average nearly 250 miles driven per day, the turbo diesel won't beat it in economy (until someone puts out a serial hybrid turbo diesel). The Prius simply won't match it in economy. KM 


#60
Aug1409, 08:07 PM

P: 4,513

From previous calculations, I assume 27% efficiency for an internal combustion engine from fuel to axle. For Lithium polymer batteries, 67% efficiency from plug to axle. Use your own numbers for cost of the electric utility and gasoline, to find an mpg equivalent. I would go 10c per KWHr and $320 per gallon. You might have better numbers. 


#61
Aug1409, 08:22 PM

Mentor
P: 12,070




#62
Aug1409, 08:35 PM

Mentor
P: 2,976




#63
Aug1409, 08:36 PM

Mentor
P: 22,239

That's a height range. A 5th percentile female is near the shortest and a 95th percentile male is near the tallest. In other words, it will fit 95% of all people.



#65
Aug1509, 12:44 AM

P: 410

KM 


#66
Aug1509, 12:53 AM

P: 410

KM 


#67
Aug1509, 01:01 AM

P: 410

KM 


#68
Aug1509, 02:28 AM

Emeritus
Sci Advisor
PF Gold
P: 12,497

As for ideas like an electric 797, while it may be possible one day, I think we are a long way from that one. When I have a practical and cost effective electric car, we can talk. The latest news about algae. http://www.exxonmobil.com/corporate/..._factsheet.pdf 


#69
Aug1509, 03:00 AM

Mentor
P: 22,239




#70
Aug1509, 03:31 AM

P: 4,513




#71
Aug1509, 07:35 AM

P: 39

I think I fill the tank on my diesel once every couple of months. It's a 2 litre tank and I probably do 600 miles between fillups. So I reckon I get 1100+MPG.
Of course I'm talking about the screenwasher tank but it seems to be just as relevant as measuring gas mileage for a journey mostly done on power from the powerstation down the road. (can I get my gas mileage up by pushing my car 90% of the way to work everyday?) 


#72
Aug1509, 07:41 PM

PF Gold
P: 3,081




Register to reply 
Related Discussions  
Iron core energy change and transformers vs. ohms law  Classical Physics  14  
Learning device, help me expound: on Faraday's choice of ion , and unionized  Electrical Engineering  2  
Difference between Identical , Equal , Equivalent  Calculus & Beyond Homework  9 