4th Gen Gas Milage Options

[T.O.Dillinder]

In about two weeks I am getting a decent bonus check, so guess what I am planning to buy when I get it.
To appease the "better" half, I was wondering what is the highway gas milage some of you have been getting with the LT1 and 6 speed, and the LS1 and 6 speed.
I thought they were around 24 to 26 miles to the gallon. Please let me know if I am off base, or I am close.
Thanks in advance.

[mitchntx]

I saw close to 30 when my 98 was mostly stock

[T.O.Dillinder]

Thanks Mitch.
That makes the wife happy.
The next purchase is going to be a multi-purpose vehicle. Daily Driver for work (Beloit to Madison), weekend cruiser, and now that I have permission from my Doc, a track day or two to take care of those wild hairs. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/laugh.gif)
Now the hard desicion, Z-28 or Trans-Am. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/burnout.gif)

This post has been edited by T.O.Dillinder: Jan 26 2009, 03:00 AM

[LT4Firehawk]

Easily 25+ highway for pretty much any 6 speed 4th gen. The LS1s do get slightly better mileage, but not by much. Where you'll run into trouble is city mileage, especially if you start modding the car.

[Ojustracing]

Stock mine 01 was 28+-, Tuned 30.5.

Miss it really bad

John

[Rob Hood]

Saw 29.5 once, fully loaded and only driving 70 in a 65. Typically get 27/28 on the road, depending on elevation changes and traffic flow. Have not taken a road trip since updating the exhaust and tune though. LS1s get better fuel mileage IIRC.

[sgarnett]

When my 01 was stock with 16" wheels, I could get 30 to 32 on the interstate if I drove carefully.

This post has been edited by sgarnett: Jan 26 2009, 04:38 AM

[CMC #37]

When my 01 was stock with 16" wheels, I could get 30 to 32 on the interstate if I drove carefully.

It does depend on how deep you put your foot into it! (IMG:http://www.frrax.com/rrforum/style_emoticons/default/smile.gif)

[KeithO]

My stock 98 (LS1) could get a hair over 30 on the highway with gentle driving.

My slightly modded 97 (LT1) with 3.73 gears gives me about 24 with not completely gentle driving.

[z28jeff]

I got 28 mpg last summer on a trip from Pittsburgh to South Carolina. And that was going through the mountains. When I went to Solo Nationals in 07, I managed 24 mpg towing a 4'x8' trailer loaded with wheels/tires, a giant (loaded) 2'x4' tool box, and all our luggage. All of that was in 6th gear with the cruise set at 70-75 mph. Commuting back and forth to work usually gets me about 18-20 mpg, driving it pretty easy. I'm sure I could get single digit gas mileage out of it if I tried. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/cool2.gif)
This is from a completely stock 94 LT1/6-speed.

[poSSum]

I thought they were around 24 to 26 miles to the gallon. Please let me know if I am off base, or I am close.

That's what we average for complete trips ... with 4.10's in an LS1 ragtop. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/cool2.gif)

[Major_Lee_Slow]

A few years ago I have gotten 28 to 30 mpg on the highway driving from Chicago to Cleveland and back. However, when I used to drive it to and from work once in a while on nice days, I only got 14 mpg. By comparison, my 2005 Yukon averages 17 mpg going to and from work.

So in other words, it's possible to get really awesome millage, but it's also possible to get really crappy millage.

[00 Trans Ram]

Trans Ams get an average of 40mpg, while Z-28s only get about 6.

Of course, I may be biased. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/tongue.gif)

[CrashTestDummy]

Trans Ams get an average of 40mpg, while Z-28s only get about 6.

Of course, I may be biased. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/tongue.gif)

Almost. My wife gets 13 out of her 94 vert. Oh wait, it has a 381 with ALMOST too much cam. A friend with a FS-legal Firebird got 30+ out of his 6-spd, and 28 towing his LaCasita trailer.

[JimMueller]

My cruise control was broken, but it appears I managed 30-32mpg driving the speed limit coming back from Sebring a few months ago.

http://www.hptuners.com/forum/showthread.php?t=20882

City driving, er, well, that's usually 12-15MPG. Now that it's mostly drivable in 6th gear down to 1000RPM, I suppose I could get more out of it if I tried... but where's the fun in that? (IMG:http://www.frrax.com/rrforum/style_emoticons/default/laugh.gif)

[00 Trans Ram]

FYI - I got better mileage out of my 2000 Trans Am than in my 4-cyl Saturn Ion (about 22mpg) or my G8GT (about 20mpg).

Both those figures are driving 100 miles per day, 20 miles city and 30 miles interstate, no traffic. The 4-cyl got bad mileage because I floored it at every stoplight because I was used to going a certain speed and accellerating at a certain rate.

[T.O.Dillinder]

Thanks to all who have chimed in so far.
I have about 1 mile of 40 mph, than the rest of the 56 miles one way is I 90- and Madison's "wonderful" Beltline.

[matt f]

Mostly stock, 28-29 mpg on the highway averaging about 80 mph whileon the road.

headers cut the mileage, gears, and cam got me down to 24 or so. Driving locally is where it really hurt. dropped from over 20 to somewhere around 16-17.

If you can find a ws6 1le formula, buy it. If not, go w/ an SS.

[mitchntx]

If you can find a ws6 1le formula, buy it.

Or the Holy Grail, which you see on craigslist first.

(IMG:http://www.frrax.com/rrforum/style_emoticons/default/2thumbs.gif)

[trackbird]

From Columbus, OH to Morgantown, WV with 2 people in the car (2002 Z28 M6) and a weeks worth of luggage, we saw 29.5 mpg with the cruise set at 80mph for most of the trip (there was a little traffic leaving columbus that was "slow down, speed up, slow down, speed up" for the first 40 miles or so).