MPG with Fuel Injector Kit?
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 24
Likes: 0
MPG with Fuel Injector Kit?
I know MPG isn't the coolest thing to talk about, but how much better would the mpg get on a stock (not numbers matching) '77 vette if i swapped the carb out for a fuel injector kit? Has anyone done it? Is it worth it? Thank you
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
Back when my 454 was carbed I got 9-9.5 mpg city. Now with EFI, more compression and more cam I get 11.5-12 mpg. 20% improvement is pretty good, I think. And that even though I replaced the 224/229 114 LSA cam with a 231/239 110 LSA which hurts mpg. I've also got 21 mpg highway but the 5 speed really helps there. Carbed was 15 mpg, but I had a 4-speed at the time so not comparable.
Burning Brakes
Joined: Oct 2012
Posts: 1,152
Likes: 252
Has anyone done it?
mpg
If would take a couple hundred tanks of gas to break even to justify by gas mileage.
R
Last edited by Dynra Rockets; Dec 18, 2018 at 02:49 PM.
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
My 69 with a 434SBC Dart pro 1 heads full roller valve train 200r4 and 3.08 rear gears was getting 21 to 23 mpg with a Holley spread bore. It didn't have a choke so when the temps went down it was very hard starting and the carb always very tempermental, I had gone through it three times and figured it was time for EFI. Went with the Sniper system. and cannot seem to get rid of RFI, it konks out a lot sometimes when going to accelerate it just bogs and now getting maybe 15 mpg. Thinking about going back to a choked carb. Disgusted T
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Safety Car
Joined: Sep 2001
Posts: 4,160
Likes: 554
From: Glenbeulah Wi
My 69 with a 434SBC Dart pro 1 heads full roller valve train 200r4 and 3.08 rear gears was getting 21 to 23 mpg with a Holley spread bore. It didn't have a choke so when the temps went down it was very hard starting and the carb always very tempermental, I had gone through it three times and figured it was time for EFI. Went with the Sniper system. and cannot seem to get rid of RFI, it konks out a lot sometimes when going to accelerate it just bogs and now getting maybe 15 mpg. Thinking about going back to a choked carb. Disgusted T
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
On my '72 the OEM L48 got maybe 16 freeway good day.....ran fine, no issues....put L98 top on it, and got 24 on the freeway.....no overdrive.....Muncie 4 speed 336 rear....
since then, 20 years ago, the car has grown a L98 engine with LT1 topper and HEI in back.....and a 200 4r trans and to be quite candid, the thing has never seen an entire day of freeway use, but city mpg picked up about 5 mpg....
see engine in link below....
since then, 20 years ago, the car has grown a L98 engine with LT1 topper and HEI in back.....and a 200 4r trans and to be quite candid, the thing has never seen an entire day of freeway use, but city mpg picked up about 5 mpg....
see engine in link below....
Safety Car
Joined: Jan 2004
Posts: 4,549
Likes: 343
From: Glastonbury CT
Sounds good i have a 77 L-82 with a 4 speed and only get 20 on highway and 12 in city but i always have my foot in it. I thought of going in that direction to have easier starts and less plug following Let me know your out come!