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posted by Long Lance
Off the top of my head, there are three alterations which would help a lot
First and foremost, combustion efficiency needs to be raised, Remember the exhaust should theoretically contain water and carbon dioxide only? [Edited by Don W]
“ . . lightweight construction, especially for drive train and engine . . “
“ . . generous use of electric transmission and capacitors to regain some energy upon decelerating,
Originally posted by donwhite
If I had to choose between spending a limited sum on capacitors or batteries, I think I’d vote for trying to improve batteries. It’s a matter of amps. Batteries hold more amps.
Amps are power. Not volts, where capacitors excel.
posted by Zaphod58
I worked at a flight school. A lot of people come in and buy 2-3 gallons of avgas. It's 100 octane. They'd mix it 10-1. 10 gallons [87 octane] gas to 1 gallon avgas. According to them the engine ran better and they got a bit better gas mileage. Especially with older cars. [Edited by Don W]
Originally posted by donwhite
C/T, was the Geo Metro a 3 cylinder, 4 cycle engine? An abomination only GM could devise. As in Corvair and Vegas. And that half of a V8 in the first LeMans. Or the small block 350 diesels offered in 1970s Oldsmobiles? At least the Saab 93 was 2 cycles. 6 firing impulses every 720 degrees of crankshaft rotation. A bit peaky on torque, however.
[edit on 7/7/2006 by donwhite]
Originally posted by apc
. A leaky exhaust manifold will murder your mileage. The oxygen sensor in the exhaust line will be getting fresh air from the leak, confusing it into thinking there is more oxygen in the exhaust than there should be, meaning it tells the computer to add more fuel. Wasted fuel. It's amazing how many cars drive around with exhaust leaks. After the catalytic is no big deal other than the noise. But O2 sensors are usually right before the cat or at the manifolds. If there's a leak near them, they'll get mad.
There are various driving techniques that can improve your mpg, for instance try to keep your vehicle at a constant speed and throtle pedal in a constant position (stop/starting murders mpg) if driving in town when aproaching stop lights aproach them slightly slower and try to keep the vehicle moving so that when the lights change it isn't at a standstill this will also save fuel.
posted by Desert Dawg
I would argue the point:
“ . . [today’s] vehicles get worse fuel economy than vehicles of the past. Auto manufacturers are putting larger engines in bigger vehicles, which results in unsatisfactory fuel economy. [Edited by Don W]
Originally posted by justin_o_guy
Seems to me the exhaust manifold is under pressure & not gonna be sucking air in, though an honest to goodness mechanic might be able to convince me otherwise. I expect, being the bonehead I am it would take paper & pencil & a good bit of splainin to make me believe it.