Indeed the A6M2 would have caused the Spit I a great deal of trouble. They gave the Spit V's and Hurri's all they could handle in the South Pacific.
There is a good artical on that matchup on the web and in several publications. Many BoB veterens found themselves on the wrong end of the A6M2.
Also I don't think the performance of the Spit I and the A6M2 was that far apart especially at sea level. Just check the AH performance data.
And again the AH data shows the Spit MKI with 137 gallons of internal fuel. I don't think this is right.
More to the point however look at a P-51D from the POH.
10,200lbs
269 gallons internal
No external fuel
80 gallons per hour
35,000FT
1,200miles range
3 hours flight duration at 408MPH!!
With 29 gallons of fuel remaining
Not including 68 gallons fuel for warmup takeoff and climb to 35,000FT
How can you even begin to compare the BF109 or FW190 performance to the P-51D with full fuel.
Also
F4U-1D internal fuel 12,100lbs 237gallons internal only
Max continous normal power
Range 370 miles 15,000FT 210 GPH / 210 gallons used.
Max range cruise internal fuel 945 miles 195MPH 5,000FT 42GPH
P-38L 17,400lbs 410 gallons internal only
Max continous normal power
450miles range 360 gallons used at 12,000FT
Max range cruise internal fuel 1,210Miles 6,000FT 173MPH 50GPH.
How do these aircraft compare? These numbers are max range not max continous power. Is this represented fairly in AH?
Bf 109F2 440 miles
Bf 109 G2 528 miles
Bf 109 K4 356 miles
Spit Vb 470 miles
Spit IX 434 miles
Seafire IIc 775 miles
Hurri IIc 460 miles
Fw190 A3 497 miles
Fw190 D9 520 miles
La5 475 miles
La7 395 miles
A6M5 1194 miles
N1K2-J 1293 miles
Ki-61-I 684 miles