Damn...I figured it would 60 ft better than that if it runs 11's. That is not at all a slam on your car ..just surprised.My chevelle used to 60 ft 1.73 on M &H 's and should run mid 12's.I say should because I have never ran the quarter with it but in the eighth it ran 8.04 It weighs 3700 lbs has a 406 small block chevy with Dart heads and 11.1 but has a hydraulic cam. Turbo 400 with a 10 inch converter and a 12 bolt rearend with 4.10 gears. I built the whole car myself when I was 18 years old.I haven't messed with it in a long while. I have a Big Block Nova that takes up all my money and time.
I am guessing based on your 18 mpg the thing is geared relatively high.
3.73's but i have the SCT pro tuner package with a laptop on the passanger seat so it is tuned to perfection...i've spent about 12 hours on the dyno getting it perfect.
I love old chevys...nova's and chevelles are my favorites. i have a friend with a 468 and a 8-71 blower on top in a 72 nova. 9 second car on pump gas...
1.68 on nitto's is actually good down here. i could probably do better with drag springs and some 90/10's up front but i just cruise around in it so i have it setup for street driving(progressive springs and stock shocks/struts). i've had it 4 years and only been to the track 5-6 times. i built the engine in my garage.