MPG with a 383

[Heslekrants]

Just went thru my 1st tank of gas on my new 383 and averaged 12.8mpg over 410 miles of mostly city driving.

I passed the 500 mile mark yesterday so I ran her up to 5000rpm. It almost seems wrong :biggrin: for a Suburban to be this quick. The poor little Ricer with the huge fart pipe bit off more than he could handle...

[DarkCharisma]

Nice. :D I liked my 383 in my '86 burb.

[S/C Z71]

:burn:

[5.7L JWL]

Sweet man. Yeah, though I walk through the valley of rice , I will fear no import for I have TORQUE.

[TigerEyz3]

Just went thru my 1st tank of gas on my new 383 and averaged 12.8mpg over 410 miles of mostly city driving.

I passed the 500 mile mark yesterday so I ran her up to 5000rpm. It almost seems wrong :biggrin: for a Suburban to be this quick. The poor little Ricer with the huge fart pipe bit off more than he could handle...
I'm impressed, assuming you have the same tank size I do - 410 miles from a 25 gallon tank (16.4mpg). But based on your stated mpg assessment (12.8 mpg), seems you've gone through more than one tank.

I get about 375 miles/tank (15 mpg) combined: city/hwy/towing. I'd love to have a 383 when my current motor fails - more torque is always nice. :10: But until that happens, I'm content to rock the 5.7L :rocking:

[GreaseDog]

its not uncommon for a new motor to get lower fuel economy before its been broken in. and if its not a new motor, there's a pretty good chance that the ECM hasnt been finely tuned for the combo.

[Heslekrants]

I have a 42 gallon tank. Cost me $125 to fill it today and I wasn't on empty.

When I had the ECM reprogrammed it made a world of difference on the driveability.

It is a new motor so I was pretty happy with 12.8mpg city because every new motor I've had has been a gas hog until broke in.

I've already put 100 miles on this tank today so I should have this motor broke in soon.

I'm planning on going to the track(1/4) to race against my wife's 06 Mustang sometime in October or may wait until March when they open for next season.

[thefermanator]

The poor little Ricer with the huge fart pipe bit off more than he could handle...

Them ricers do that ALOT! It's always nice to prove to em that a coffee can exhaust tip and 200 stickers don't equal out to power.