Anybody bother to record MPG on their steeds?

bnickel said:

you can pretty much bet that the synthetic oil will help a little bit, probably not much though, i'm guessing 2mpg max and likely less than that but every bit helps

Click to expand...

Next on the list is that. I changed my oil less than 200 miles ago, but when I change again in 3k miles, the rebuild will have almost 6k miles on it. I know I could easily start on synthetic after 3k, but better safe than sorry. I remember in my '68 the first time I ran Mobil1 it made a great difference in throttle response and gained me probably .5mpg, too.

Come to think of it, why didn't I think of that? This thing's still breaking in. I'll probably see MPG improvements for another 10-12k miles all other things equal...

25 is still killer for a 331, even with all that highway time. and 20/21 with a 347 is about what I'd expect with an overdrive cog on the highways. I've heard that 302's with 5-speeds can touch 30mpg...

I think I got it! Gapping my plugs last night, they were black with a hint of brown-tan on the ends of the electrodes. Guess even though the WOT tuning is spot-on, it's running a wee bit rich otherwise.