However propellant is seldom more than a few times more expensive than gasoline per kg ( as of 2009 gasoline is about $ 1 / kg or less ), and although substantial amounts are needed, for all but the very cheapest rockets it turns out that the propellant costs are usually comparatively small, although not completely negligible.

However, appropriate refining processes equivalent to hydrocracking can transform shale oil into a lighter-range hydrocarbon ( gasoline ).

However reports are inconsistent ; commonly they are included in descriptions of ( e. g. ) " 200 MPG carburetors " intended for gasoline use.

However, as crude and gasoline prices continued to rise between 2007 and 2008 this practice became so contentious that in June 2008 the Commodity Futures Trading Commission, the Federal Reserve, and the U. S. Securities and Exchange Commission ( SEC ) decided to create task forces to investigate whether this took place.

However, once in office he adopted a budget designed to curb inflation by slowing economic activity, and also proposed an 18 cent per Imperial gallon tax on gasoline in order to reduce the budgetary deficit.

" However, components of gasoline other than isomers of octane can also contribute to a high octane rating, while some isomers of octane can lower it, and n-octane itself has a negative octane rating.

However, gasoline is fungible and though Alice may have a preference for a particular brand and grade of gasoline, her primary concern is that the level of fuel be the same ( or more ) as it was when she lent the vehicle to Bob.

However, looking at the well-to-wheel efficiency of electric vehicles, their total emissions, while still lower, are closer to an efficient gasoline or diesel in most countries where electricity generation relies on fossil fuels.

However, no supporting evidence was offered, and evidence from the large increases in oil prices in 2008 would suggest that quantity demanded for gasoline did actually fall as a result of increased prices.

However, its energy density per volume unit of 26 MJ / L is lower than either that of petrol or fuel oil, as its liquid density is lower ( about 0. 5 — 0. 58, compared to 0. 71 — 0. 77 for gasoline ).

However, products that rely primarily on paper ( i. e., newspapers and toilet paper ) and / or fossil fuels ( i. e., electricity in most countries and petroleum gasoline for automobiles ) have only increased in price.

However, teams are given a credit card which they must use to purchase airline tickets ( and in the case of the " Family Edition ", the purchase of gasoline ).

However, many aromatic compounds ( carbon chains forming rings ) such as benzene are found naturally in gasoline and cause the health risks associated with prolonged exposure to the fuel.

However, it may also be used as a fuel, most often in combination with gasoline.

However, it is much less volatile than gasoline, and therefore has lower evaporative emissions, producing a lower exposure risk for an equivalent spill.

However, it is a fact that a mixture of acetone, liquid acetylene, and water will run a gasoline car motor and the exhaust gas smells like cyanide.

However, it will also prematurely corrode the engine and is much more expensive than gasoline.

However, when a gasoline internal combustion engine is operating under less than full load, the effective compression ratio is much less than the measured compression ratio.

However, lodging, groceries, gasoline, campsites, and other amenities are available elsewhere in the region.

However, the crew compartment is now further forward and the new GAZ-41 gasoline V-8 engine is in the rear.

However, the sulfur found in much of the world's low quality gasoline caused some Nikasil cylinders to break down over time, causing costly engine failures.

However, in the US market only the 1. 6L gasoline engine is offered, in two body styles: a four-door-sedan and a five-door hatch.

However, with engine rule changes for the 1990 season and the launch of the new Aston Martin Volante model, Ford provided the limited supply of Cosworth engines to the Jaguar cars racing team.

However, raising the engine speed too high while engaging the clutch will cause excessive clutch plate wear.

However, a Diesel engine will be more efficient overall since it will have the ability to operate at higher compression ratios.

However, changing exchange rates doubled the cost of the engine and transmission over the life of the VL.

However, this failed to take into account the 600 jobs that Holden previously announced would be shed when production of the Family II engine is set to wrap up in late 2009.

However by 1783 the more economical Watt steam engine had been fully developed into a double-acting rotative type, which meant that it could be used to directly drive the rotary machinery of a factory or mill.

However Id Tech 4 had far fewer licensees than the Unreal Engine from Epic Games, due to the long development time that went into Doom 3 which Id had to release before licensing out that engine to others.

However, a turbine's power output and efficiency both drop dramatically with rotational speed, unlike a piston engine, which has a comparatively flat power curve.

However the use of modern engineering materials coupled with alternative engine configurations has meant that these types of system are now a cost effective opportunity.

However, programmers taking advantage of these changes lost backwards compatibility with the unmodified Quake engine.

However, work was very slow on the engine, since John Carmack, the main programmer of Quake, was not only developing a full 3D engine, but also a TCP / IP networking model.

However, engine efficiency is not the whole story.

However, as speeds rise, the resultant exhaust speed goes down, and the overall vehicle energetic efficiency rises, reaching a peak of around 100 % of the engine efficiency when the vehicle is travelling exactly at the same speed that the exhaust is emitted.

However, ROTT's engine was still the first to pioneer myriad features which would be found in many later games, such as panoramic skies, simulated dynamic lighting, fog, bullet holes, breakable glass walls, level-over-level environments ( made possible by " gravitational anomaly disks "; suspended objects that collectively form stairs, floors, etc.

However, even though it used the WebKit engine, the Android built-in browser did not support SVG prior to v3. 0 ( Honeycomb ).

However, since the charge in the cylinders is being pushed in by this air pressure, it means that the engine will normally produce only half-power at full throttle at this altitude.

However, in later versions Mercedes changed to a 60 ° angle, making the engine more compact and allowing elimination of the balancing shaft.

However, the scripting engine will continue to be shipped with future releases of Microsoft Windows and IIS.

However, problems with apex seal wear led to frequent engine failure, which led to large warranty costs for NSU, and curtailed further Wankel engine development.

However, as gas pressure participates in seal efficiency, racing a Wankel engine at high rpm under no load conditions can destroy the engine.

However, instead of comparing engine performance, the gross aircraft performance as complete systems can be compared using first principle definitions of power, force and work with the requisite considerations of constantly changing effects like drag and the mass ( of the fuel ) in both systems.