Top Speed and Track Test Results

According to Road and Track magazine 0-60 tests:

model	publication date	time
MK1	4/63	15.5 seconds
MK2	6/65	15.0 seconds
MK3	9/67	13.6 seconds
MKIV	5/71	15.9 seconds
1500	5/73	15.4 seconds
1500	6/76	15.3 seconds
1500	1980	14.3 seconds

Road and Track 1973 Spitfire

mph	time
0-30	4.7
0-40	7.2
0-50	10.9
0-60	15.4
0-70	21.6
0-80	31.8
Top Speed	94

Road and Track 1973 GT6

mph	time
0-30	4.4
0-40	6.5
0-50	9.3
0-60	12.6
0-70	17.5
0-80	23.4
Top Speed	107

Autocar March 1975 Spitfire

mph	time
0-30	4.8
0-40	6.3
0-50	8.8
0-60	13.2
0-70	18.1
0-80	25.3
Top Speed	100 average (102 max.)

Spitfire According to Autocar Magazine:

	MkI	MkII	Mk3	MkIV	1500	MkIV US 1971	1500 US 1971
0-30	5.0	4.7	4.3	4.8	3.8	4.5	4.7
0-40	7.6	7.0	6.8	7.3	6.3	7.2	7.2
0-50	10.9	11.0	10.1	11.0	8.8	11.3	10.9
0-60	17.3	15.5	14.5	16.3	13.2	15.9	15.4
0-70	25.8	21.8	20.7	22.9	18.1	25.0	21.6
0-80	36.9	33.6	30.7	33.3	25.3	40.2	31.8
0-90	–	–	49.3	–	38.7	–	–
0-100	–	–	–	–	–	–	–
max speed overdrive	–	90	94	87	97	–	–
max speed 4th gear	92	92	95	90	100	86	94

GT6 According to Autocar Magazine:

	MkI	MkII	Mk3	Mk3 US 1973
0-30	3.6	3.5	3.9	4.4
0-40	5.9	5.2	5.5	–
0-50	8.5	7.2	7.7	9.3
0-60	12.0	10.0	10.1	12.6
0-70	15.6	13.7	14.0	–
0-80	21.2	18.2	18.4	23.4
0-90	31.3	26.2	24.5	–
0-100	–	39.3	35.8	–
max speed overdrive	106	107	–	–
max speed 4th gear	100	94	112	104

Related Links:

Car and Driver’s Showroom Stock Sports Car Comparison Test – April, 1973
This link tells the story of Spitfire’s head to head comparison with its rivals.

Spitfire (car) vs. Spitfire (plane) Comparison (pdf)Remarkable similarities.