The LT1 engine didn't get the same mileage numbers as the LS1 engine. The LS1 gets pretty close to the 3.8L in Mileage but not quite. I get about 300 miles per tank and I fill up around the 1/4 mark.

Massey

 

i got a 97 3.8 and i refill when i hit 250 miles on the tank and i fill it full it usually takes 10 gallons or so, i assume i get like 25mpg or so based on that

 

could be the weight of your system and turning those 20s also (and take no offense) are you a big guy im about 250lbs and i get like 1-2 mpg less than the 120lb girl that owned my car b4 me and we drive about the same way

 

Wow. Nice way to tell someone to go on a diet!

Really though, if you are spending a lot of time driving in town, with a lot of stop and go, your mileage will take a major hit. No matter what engine / tranny / rear end you have.

Cruising on the highway at about 55-60 mph is usually the most efficient speed for mileage.

 

lol i think i need the diet

 

im actually pretty small haha. like 150 lbs. but it probably is a combo between my rims and system. the guy i bought the car from put the rims on. idk why you would put that big of rims on a camaro. how much do you guys think my system weighs? 2 12s and 2 amps and a box.

 

there is no way of knowing that.. there is a million different amp and sub sizes and weights out there same with the box. you would just have to weigh it all.

 

My 3.4 gets 18mpg and that's with spinning tires off every stop lights and driving like the cars stolen. If I drive like a normal human being I get about 23. On highway I get about 27. I fill my tank at about 230-235 miles and that about 12.5 to 13 gallons of gas from 1/4 tank to full. So yeah I get about 18-19 with spirited driving lol

 

Wow, some of you guys really need to check the facts instead of posting "what you think".
You need to look in the Owners Manuals in the Capacities and Specifications sections:

2001:
Fuel Tank . . . . . . . . . . . . . . 16.5 U.S. gallons (63 L)

1998: http://content.gmownercenter.yahoo.c...aro_owners.pdf
1999: http://content.gmownercenter.yahoo.c...aro_owners.pdf
2000: http://content.gmownercenter.yahoo.c...aro_owners.pdf
2001: http://content.gmownercenter.yahoo.c...aro_owners.pdf
2002: http://content.gmownercenter.yahoo.c...aro_owners.pdf

 

Here are some EPA MPG #s:

City/Highway
2010 SS Auto 16/25
2010 RS Auto 18/29
2002 RS Auto 17/28
2001 SS Auto 16/24
1995 3.4 Auto 17/26