kyler said

I made sure that my choke and everything are working properly, changed my thermostat, and did a few other things before recalculating my mileage.

I am not at a comfortable 15mpg, and that is ONLY city driving. There is a short "highway" mixed in there, but it's about 6 miles at 45-50 mph the whole time. So, I am happy. It is worth the small extra cost (when compared to my 18 mpg Subaru in city) to get to drive such a great car :)

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ESP47 said

Your car has a problem. I don't care how much city driving vs. highway driving you do. It's not normal for a slant six to be getting 10-11mpg unless you're flooring it from every stop.

My guess is that you have a remanufactured carb on there. Back in the day I was getting 10mpg with a remanned carb. Put a NOS carb on and it jumped to 15-16mpg. Did other modifications and now I'm up to a consistent 20mpg in the summer and no worse than 17mpg in the winter. I do more highway driving than you, but even on the weeks that I'm in stop and go more often, it still doesn't dip down much.

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