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In Reply to: RE: Yeah, afew complain they get only 19mpg.. Others like me get great mpgs. why??? posted by Elizabeth on July 08, 2012 at 10:13:16
"I love it at the fuel pump. i fuel up maybe at the most twice a month and usually only have to buy 3 or 4 gallons to top off the tank."
I never fully connected with pumping my own gas. As such, I've become interested in how far gasoline engines have come, under normal driving conditions.
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ALL gasoline engines burn gas above the Stoichiometric balance in a rich situation so the engine does not overheat (using the unburned gas as a coolant)
This has always been the situation, and usually the gas is very rich.
To better protect the valves and stuff.
I have wondered why engine designers have not figured out how to really take advantage of lean burning. The greater heat would give more power/heat IF they could figure out how to use it without melting down the engine!!!
The above isn't true any more. Materials are better and engines try to burn pretty close to stoichiometric except at cold start.
They've looked at lean burning for a long time and try to push it as far as you can---the probvlems are predetonation and creation of nitrous oxides (smog) which cannot be cleaned in the catalytic converter.
Modern engines that get the highest MPG like yours are probably direct injection (inject fuel into cylinder during cycle like a Diesel, instead of injecting & vaporizing in intake).
Actual underlying fuel efficiency of engines has been climbing for 25 years steadily, but achieved MPG has not, all because the extra efficiency has gone into heavier vehicle weight to add luxury & features.
The actual MPG not surprisingly has exactly tracked the government requirenments.
Which may seem like a contradiction, the mileage to HP ratio also matters to me. Back to audio...
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