Originally Posted by otter5555
mine gets 17.7-18 mpg every tank
re-jetted the 600 holley, advanced the timing, free flowing turbos and a super LIGHT foot
i seldom get over 50 mph here in the mountains. that helps a lot. also, the sm465 does better on gas than the th350/400.
Nice, I was getting about 10. Most my driving is freeway and I have trouble keeping it at 80 (limit is 80 mph in Montana), lead foot kinda runs in the family. I have a mild 454 with a 800 cfm quadrajet. I recently installed a a/f gauge and I'm already seeing improvements since I changed my rods. Haven't been able to check mpg but I know it's better. With alil more tuning I should get more mileage and power, also I'm going to play with a carb spacer.
My th400 is probably the least efficient trans option, but seeing as it puts up with my abuse I can't complain.