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... Super T-10 with a 3.36 rear end. I actually got right at 21 on a road trip of about 300 miles, round trip. The 18 to 20 is mostly highway... Say 75% highway driving at 55 to 60 mph.
No need to change the cam in a Manual car. I too have a ZZ4 I dont know about my gas milage but it's pretty good I'd guess I'm gotting around 18mpg or so, but I have my foot stuffed into it alot! :D
As far as performance the motor has a great power band. My best passes down the qtr mile netted 13.3 @ 103. I've had trap speeds as high as 106 by short shifting - but all the et's were in the 13.5-13.7 range.
All in all it's a great engine right out of the box. Budget about 4100-4500 to stick one in between the fenders! :yesnod:
So why do people not like '68's anyway? I know, can't stand keys on the dash?
I put in gas when it says "E" on the gauge. I'd guess about 15 but I have 3.70's and 255 40x17's giving a overall gear ratio of 3.82 to 1. Also I have a bad attitude while driving anywhere near cars with coffee can exhaust pipes.