HI guys, I checked the entire forum for an answer but I wasn't so lucky. I currently have a 1992 2.3 5 speed and thinking of buying a 1985 2.0 4 speed. I just wanna know which one has a better mpg? The 92 190e uses premium gasoline, I heard that the 84-87(?) uses regular gas?

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1984 190D 160,000 miles -sold
1992 190E 124,000 manual 2.3 -sold
2000 c230K 84,000
1995 e300 134k