454 Big Block Chevy gets 16.3 MPG on the highway :)

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454 Big Block Chevy gets 16.3 MPG on the highway :)

Post by Buick462.efi »

I took my youngest to college (we are now officially empty-nesters), it's a 490 mile round trip. Had to use the truck to bring all the "stuff" for college. So, I figured it would be a good time to do some highway tuning. I leaned the AFR at cruise to 16.5 with no surging and left it there running at 70 to 75 MPH, 2100 TO 2200 RPM. Had to do a little bit of driving around town, too for additional "stuff." All totaled - 16.3 MPG! Since then, I've driven it around town to my usual haunts (work and O'Reilly) and it's running great. I'll continue to track the MPG to get an all around number.

MSII, 3.0 board, 2.905
Spartan Lambda WB

1988 Chevrolet C1500, 80K miles, 700R4, 3.06:1 10 bolt differential

- 1990 454 +.030
- Peanut port heads
- 9.0:1 CR
- Edelbrock TBI manifold
- 454 TBI
- Compcams 260H - going for low end torque, it's my daily driver
- 8 pin HEI
- 1.75" long tube headers
- 2.5" true dual exhaust
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