4.3L mileage? - Chevy Impala SS Forum
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post #1 of 16 (permalink) Old 04-14-2003, 10:49 AM
dogma
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What kind of mileage does 4.3L engine get in highway-only driving (easy)?

Was it ever available on '91-93 station wagons?

I am satisfied with my 5.7L but would be interesting to know.
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post #2 of 16 (permalink) Old 04-14-2003, 11:14 AM
CMoney
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I've never really took the actual milage on either my L99 or LT1, but I can tell you one thing. When you have an LT1, you are alot more likely to floor it off the line, and hold it at WOT for alot longer. But the L99 needs to work alot harder to get the car moving.
post #3 of 16 (permalink) Old 04-14-2003, 05:03 PM
ghost
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L99 w/ 2.73 gears = low- to mid-20's highway.

Personal experience.

Eric
 
post #4 of 16 (permalink) Old 04-14-2003, 05:53 PM
RJI
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I had a 94 L99 W/2.73 that got 26-29 on the open road. Pre 94 used a different set up on the small blocks and I don't think they came near the mileage and performance of the 94-96 motors. I use to run from Michigan to Colorado a few times a year. When it came to the open road it was awesome.
I don't believe it was ever offered in the 94-96 Wagons.
post #5 of 16 (permalink) Old 04-14-2003, 06:50 PM
96capriceMGR
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Yeah 94-96 Caprice sedans were the only vehicle to have it as an option. I could get mid twenties with the air on and a full load(camping crap), when I first got it, even hit a high of 30mpg but that was with slick roads and an unusually light foot. Then a couple manifold bolts broke and milage dropped to a low of 19-21, even with a heavy foot. That was with 2.93 gears. The L99 does have to work much harder to move the car, so it is nowhere near the milage monster you would expect, many an LT1 powered car will clip off mid twenties when driven conservatively.
post #6 of 16 (permalink) Old 04-14-2003, 10:48 PM
94LT1
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my neighbor has a '96 L99 caprice and the best he's got was 29 on highway

the guys like 70 something....the car is beyond mint be an awesome one to get and swap in an LT1
post #7 of 16 (permalink) Old 04-15-2003, 07:35 AM
caplt4
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on my 96 before i got rear ended, about 3 weeks ago, i got on my car about 30-32 mpg, i used drive a lot to n.y., fomr norfolk, one time i took a trip for 650 miles in one full tank, i had a 25 gallon tank we have talk about this a while back, an i have seen a 95 wagon with 4.3
post #8 of 16 (permalink) Old 04-17-2003, 07:35 PM
96_caprice_classic
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I get 26 mpg all highway in my '96 L99.
Tested it last year on an 800 mile road trip.
post #9 of 16 (permalink) Old 04-21-2003, 11:30 AM
dogma
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That's excellent mileage. For my purposes, probably works better than the bigger 5.7L I have now. If I get another Caprice, that's what it will have in it.

I am not into performance, but frugal driving.

For now I will just drive the 5.7L which is another great engine.
post #10 of 16 (permalink) Old 04-22-2003, 08:09 AM
Cheavy
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<BLOCKQUOTE>quote:</font><HR>... excellent mileage ... For my purposes, probably works better than the bigger 5.7L ... If I get another Caprice, that's what it will have ... I am ... into ... frugal driving.<HR></BLOCKQUOTE>
If your engine is an LT1, then why don't you see how much mpg can be wrung out of it?
28" or even taller tires
Less aggressive gears (2.93 or numerically lower)
PCM for Less could also reprogram for
More conservative tranny shiftpoints
More TC LockUp in 3rd and 4th - maybe even a little in 2nd?)
More conservative fuel injector pulsewidths

I don't think the L99 had that much of an mpg advantage over the LT1, at least off the showroom floor.

Give the LT1 a chance.
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