Page 1 of 2 Next >

Commented On: 2014 Mitsubishi Mirage Subcompact: NY Auto Show Details


Green Car Reports 0 Views 5 comments
I'm glad to see the Mirage come to the US. The current non-hybrid high mpg car here is the iQ and it starts at $16k, pretty high price for how much car you get. The Mirage offers not only a ~10% increase in mileage, but also a lot more for most likely a lot less.

It has been said that the Mirage will be the 'spiritual successor' to the good 'ol Geo Metro that now has a cult following. The Metro was no looker either, but it was an efficiency and economical king.

Commented On: 2014 Ford Fiesta 1.0-Liter EcoBoost: Quick Drive Report


Green Car Reports 0 Views 7 comments
I'm sorry, but I must disagree. There were 50 miles to log fuel economy data over. That is plenty to get an idea of what kind of mileage the care might return.

Commented On: 2014 Ford Fiesta 1.0-Liter EcoBoost: Quick Drive Report


Green Car Reports 0 Views 7 comments
I barked at Volker last time for this in the first Fiesta review you linked. Here we go again. This is just another not so green car report on the Fiesta. I can find a ton of other sites willing to tell me the 0-60 times that I could care less about. I read here for GREEN CAR info.

Commented On: Could Hybrids Use Lead-Acid Batteries? Startup Says Yes


Green Car Reports 0 Views 7 comments
Ditto on cycle life as going to nimh or lithium are major jumps up in that area.

Also, if you're putting lead acid batteries in hybrids, you want your batteries to be partially charged while driving so there is room to capture energy via regenerative braking. But, lead acid batteries do not like being partially charged because they suffer from sulfation which reduces capacity.

Commented On: 2014 Ford Fiesta EcoBoost Prototype: First Drive


Green Car Reports 0 Views 9 comments
You call this a 'green car report'? You spent the whole time reving the daylights out of the engine and don't get any MPG readings? C'mon, the Fiesta is not a sports car. Its a commuter, why not drive it like one and actually get us some useful info. If I wanted to read an average 'it doesn't have enough power' review I'd go to one of a hundred other car sites.

Commented On: Getting Good Gas Mileage Is Hard; Will Tinier Engines Really Help?


Green Car Reports 0 Views 45 comments
I'm sorry you don't seem to understand. By saying they put out the same amount of power it is like saying you have the same car with two different engines in a real world situation. For example, for a car to go 55 mph you might need 15 horsepower to maintain that speed. If you put a 1.5L engine in that car it is going to be loaded to say 40% of its maximum output. If you put a 2.0L engine in the car with the same drivetrain (gearing), the engine is only going to be at say 30% of its maxmimum output. If you look at a BSFC map and look at any engine it is going to be more efficient at 40% load than 30% load. That is why smaller engines return better efficiency.

Commented On: Getting Good Gas Mileage Is Hard; Will Tinier Engines Really Help?


Green Car Reports 0 Views 45 comments
If you have two engines of different displacements connected to the same drivetrain putting out the same amount of power, its obvious that the smaller engine is going to be at a higher percentage of maximum load. When you look at BSFC charts you can see that an engine that is running at a higher percentage of maximum load will return greater efficiency. So, all things being the same, a smaller engine will return greater efficiency.

Commented On: Getting Good Gas Mileage Is Hard; Will Tinier Engines Really Help?


Green Car Reports 0 Views 45 comments
Sorry, but your conclusion couldn't be more wrong. Brake specific fuel consumption (BSFC) maps clearly show that when you have two engines of different sizes loaded to the same amount and geared the same, the smaller one runs more efficiently even though it is 'working harder'.

Commented On: Getting Good Gas Mileage Is Hard; Will Tinier Engines Really Help?


Green Car Reports 0 Views 45 comments
And I would say that the gain in better mpg is largely due to the engine's ability to emulate a smaller engine, not because it actually uses a larger engine.

Commented On: Getting Good Gas Mileage Is Hard; Will Tinier Engines Really Help?


Green Car Reports 0 Views 45 comments
I'm going to have to agree with Darin. The Prius example is a bad one as well. The 1.5L Prius engine didn't use an external EGR system. When they went to the 1.8L engine they added a cooled external EGR system that can flow up to 30% of the air intake charge as EGR gas. This effectively reduces the displacement of the engine by that same 30% making it capable of being either a 1.8L or a ~1.26L engine. So, it is apples and oranges to compare the two.
Page 1 of 2 Next >