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Crawler based search engines such as google .com HUman powered directories and Hybrid search engines
they have small cylinder and they also fire at every second stroke.
List of search engines : altavista.com search.aol.com ask.com msn.com webcrawler.com
Automobiles, motorcycles, outboard motors and generators/small engines. That list may not be complete.
A list of all engines used in Mercedes-Benz vehicles can be found on the Wikipedia website. Starting in 1931, this list includes gas and diesel engines and inline and v cut engines as well. There are also listings for bus and truck engines for commercial vehicles.
It depends on the engine type. I'll list the MPG numbers and engines below. 2011 E-SERIES FORD VANS 5.4L Triton V8 Gasoline Powered - - - 18mpg highway / 12mpg city 6.8L Triton V10 Gasoline Powered - - - 15mpg highway / 10mpg city 6.7L Powerstroke V8 Diesel Powered - - - 20mpg highway / 14mpg city
Google.com
list of barrier in the society
I posted the list of search engines from wikipedia in the related links box below.
Assuming "powered by" means produces power not uses power a partial list would be:wind turbinesair turbines (dentist's drills)steam turbineshydroelectric power turbineswater wheels at millssome strandbeestsjet engines
BlingoDeeperWebExciteHarvester42HotBotInfo.comIxquickKayakMammaMetacrawlerMobissimoOtaloSideStepWebCrawler
A very small list would include lack of air, dealing with direct sunlight, and weight vs. thrust of the spacecraft and its engines.