What are you getting for fuel mileage from your 455

I know, I know, if you want gas mileage.......you wouldn't be driving a 455!

Just curious to see what you are getting. Anything form stock to 500 hp.

 

Is it really a stupid question when.....

gas is $2 a gallon? Yes, if you were concerned too much about it the big blocks would be stored away for a while. Personally Im curious what everyone else is getting so I know what to expect. Does it really matter enough to change my plans for driving. No, not really. Even running premium Ill probably drive it the same and tromp on it here and there. But then again, if it was about fuel economy we would never have bought the big cube motors, would we? No, its about fun factor. Atleast for most of us.

 

I get about 9 miles to the gallon. Stock bottom end (I assume), milled stage 1 heads, cam, headers, B4B intake and a holley 850 DP carb. I probably could get a bit better milage if I went with a Q-Jet.

 

I averaged 12.5 mpg round trip to Salem from Maine. The engine spent a good deal of time between 3200-3700 RPM on the highway. I have a Holley spreadbore replacement carb. I don't even know how big - it came on the car when I bought it. I am planning to put the Q-jet back on after a rebuild.

 

I average about 12 mpg.

 

I get around 10 on the hiway and abt 8-9.5 around town.

 

Gas Mileage

I averaged 12.5 mpg from Duluth MN to Youngstown OH
455 .030 over with 3:42 gears.
Tires = P235 60R 15
Anywhere between 2800rpm to 3400rpm.

 

Mileage

780 miles of travel to and from salem for BPG Nats - 13.3 average

Includes beating the snot out of the car for maybe 12 runs down the track.

3.08 rear but short P235R14 tires.

3000-3300 rpm at 60-70 mph cruise.

 

I use 1 gallon per .25 mile. :Brow:

 

GS 455 MPG

When we made the trip to the BPG Nationals I did between 13-14 mpg!!! Even Paul (pwm72) could not believe how far I went between pit stops, AL.

 

My 72 GS with a 3.31 axle and a 200-4R pulls 17-18 on the highway

 

With my 462 in a C20 pickup, I get 10.5 in town, 12 on the highway in Drive. I got 14.09 driving to salem and back, and on another trip, in OD after unhooking the EGR and recurving the distributor, I got 17.74!

The truck tips the scales at 4600 lbs empty, with 1/2 tank of gas in each tank. I believe the coeffecient of drag is comparable to a freightliner :laugh:

 

I get about 14.5 MPG. Car is a 77 Regal, stockish 1970 455, Q-jet, S/P TH400 and 2.73 rear end. and.....I drive this car EVERY DAY.
Fred

 

I get 15 mpg with my 71 Electra (455) but keep in mind it came with a 2.73 rearend.
I got about 14 mpg with my Centurion (455) with stock 2.93 gears.
I replaced the rearend with a 3.46 and now I get 12 mpg.

 

The 69 Wildcat I had back in highschool would around 8-10 in town, but get it out on the highway and it would get 18-20 running at 65-70mph. This is with TH400 and 3.08 gear.

I'm getting about 15.5 out of the 350 in my Century, TH350 and 3.08 gear.

 

Thanks for the info.

 

Milage

Hi, Got almost 16 MPG on way back from Salem. 455 with turbo 400 & a 2.56 rearend. RPM's at between 70 &75 was 2250 to 2450. Motor has Stage 1 heads, Osbourne Q- JET, Mallory ignition box & a mild cam. Stock appearing, ported exhaust manifolds,2&1/2 X pipe exhaust w/ flowmaster 14" mufflers. Tires were 295/50/15. Nice cruising combo. JOE :grin: :grin:

 

Last time I checked I got 13.9 climbing 7000 feet over a 90 mile run and staying near the speed limit. Running a 2.73 rear and 3.44 first in 4 speed. I thought this mileage was pretty remarkable. Bad Brad attributes it to his engine building skills.:grin:

 

Why is everyone running "Highway" gears?

Is there something I should know?

Do the BIG Buick's not like gears?