What is your drivetrain?

[thepcsurgeon]

Zz502 with Edelbrock Power Pkg installed, custom Barry Grant 850 dbl. Pumper bench flowing 1020, B&M th400 race transmission with reverse, manual valve body, Ford 9" rear with Mossr 35 spline axles, strange center section with 3.50 spooled gears. Wilwood brakes slowing me down.

 

[Mike P]

507 CI Cadillac, TH400, Ford 9" with 2.75 gear. 15-17 MPG at 75 MPH with the AC on.

 

[olds307 and 403]

Olds 350,2004R and 3.42 gears. I can pull out 20 imperial mpg no problem. I got 18 mpg with the 403 driving it hard, 20 mpg in winter with 2.56 gears. I am going 424 stroker based off the 403, could care less about gas mileage for it.

 

[MightyCarlo86]

Running a ZZ4 350 with Edelbrock performer rpm intake and Edelbrock 750 cfm carb and MSD streetfire ignition box, built 200-4R transmission 2800 rpm stall converter and 3:73 posi rear

 

[pontiacgp]

It gets decent mileage when idling.

...

it came with a 305, 200r4, open 2.41 rear and stock exhaust. It now has a 355 SBC, vortec heads, ZZ4 roller cam, headers with 2.5 SS duels, T5 WC and an 8.2" 3.08 Eaton posi rear

 

[ITh4n4tosI]

5.3L out of a 03 silverado, made into a 396, 700r4 trans and putting in a ford 9" with 4.11 no mileage numbers

 

[spidereyes455]

81 Grand Prix- 305 from an 82 Z28 with CrossFire injection using a 89 firebird TBI engine harness and ECM , Borg warner T-5 trans and 3.23 posi. No mileage numbers
87 442 - 100% stock
80 Cutlass - 403 Olds with Edelbrock performer intake Heddman headers original Qjet carb TH350 stock converter with B&M shift kit and 3.73 posi from a Monte SS. Don't remember mileage numbers.

 

[tc1959]

350 HO Tech Specs: Part #19210009
Engine type: Chevy small-block V8
Displacement (cu in): 350
Bore x stroke (in): 4.00 x 3.48
Block (P/N 10105123): Cast iron with 4-bolt main caps
Crankshaft (P/N 14088526): Nodular iron
Connecting rods (P/N 10108688): Powdered metal steel
Pistons (P/N 12514101): Cast aluminum
Camshaft type (P/N 12480033) hydraulic roller
Camshaft lift (in): .435 intake/.460 exhaust
Camshaft duration (@.050 in): 212° intake/222° exhaust
Cylinder heads (P/N 12558060): Vortec iron; 64cc chambers
Valve size (in): 1.94 intake/1.50 exhaust
Compression ratio: 9.4:1
Rocker arms Roller/ self aligning
Rocker arm ratio: 1.5:1
Water pump (P/N 88894341): Cast iron, long-style
Flexplate (P/N 14088765): 12.75"
Recommended fuel: 92 octane
Ignition timing: Base 10° BTDC, 32° Total
Maximum recommended rpm: 5500
Balanced
Reworked Q-Jet Carb.

Dual exhaust with 2 in 2 out catalytic converter and twin Flowmaster super 50 mufflers
Transmission 1992 700R4 from a Caprice 9C1 Gill Younger valve body. Painless TCC kit.
7.5 rear end with Eaton limited slip and 3:24 Richmond gears

Nordskog digital dash

17 inch Summit legends wheels with 235/50/17 Michelin tires.
17 MPG on the highway. (less in town I can't keep my foot out of it)

 

[86-blk442]

355 SBO
-Xe262 cam
-9.5:1 comp
-Performer rpm
-Q-jet
-W31 valves #5 heads
-Headers 2.5" dual exhaust with X pipe

200-4R with tight (1600 stall) converter & lockup, 3.73 rear
15+ mpg stop and go

 

[dr78442]

Oldsmobile 455 EFI
TURBO 400 with gear vendor overdrive
8.5 rear with 3.90 gears
Unknown MPG. Car wasen't built for fuel economy so I never bothered to check