Specifications

The short range of the Bf 109E prevented it from escorting Luftwaffe bombers past London, leaving the greater part of the British Isles free from enemy attack on training and production sites. 
 

Aircraft - ME-109 (German)

For the most part, American aerospace testing was done on American aircraft.  However, beginning with WWI, whenever the United States obtained examples of foreign aircraft - either from friendly countries through cooperative arrangements or from enemies via capture or defection- they were likely to wind up at McCook Field or Wright Field for a thorough evaluation which included flight testing if possible. 

"During WWII evaluations at Wright Field included allied aircraft like the Russian Yak-9 and the British Spitfire and Mosquito, and enemy aircraft including the German JU-88, ME-109, FW-190, ME-262, and the Japanese Zero.  The end of the war brought large numbers of captured aircraft for evaluation.  As with other test flight activities, much of the foreign aircraft evaluation moved to Muroc Air Base (later Edwards AFB) after the war, but even then the occasional foreign aircraft came to the Miami Valley for testing, as a MiG-15 (courtesy of a North Korean defector) at Patterson Field attests." (Source: Against the Wind)

Specifications

Span: 32 ft. 6.5 in.

Length: 29 ft. 5 in.

Height: 8 ft. 2.5 in.

Weight: 5,800 lbs.

Armament: One 30mm MG 108 cannon firing through propeller hub and two 13mm MG 131 machine guns

Engine: One Daimler-Benz DB 605D inverted V rated at 1,850 hp. for take-off

Crew: One

PERFORMANCE

Maximum speed: 426 mph. at 24,280 ft.

Source: Air Force Museum