General LSX Automobile Discussion - Does 17mpg sound right?

I just want to run this across you all.

basically ive kept track of my mileage for a couple months and I keep getting about 17 mpg

basically all of my driving is stop and go and never get above 60 because im never on a highway, and I drive it pretty careful (haven't taken it about 3krpm in a while)

what do you think, does 17mpg seem right?

yeah that seems ok

Seems ok to me. I think i get about that with city driving.

stop and go will actually take more gas then you think it will....i think mines around 19 or 20

sounds about right, how are you figuring it out? i will fill my tank, reset the odometer. Then drive till i want to fill up, go fill up and take the amount of gallons and divide it into what i get from the trip. then reset it again.

sounds decent to me ive had a smaller less powerful car and it averaged 16 driving like a grandma on easter sunday. 83 RX-7

that sounds about right. My old lt got about the same

same here around 16-17 in town and 23-25 on highway.

whats the average miles you get a tank mines 260-280 with a 50/50mix city and highway. and the occasional exhibition of speed.
the most i have gorren with the mods in my sig was 315 but that was driving 5 miles under everywhere.

stop and go will actually take more gas then you think it will....i think mines around 19 or 20
That's one of the biggest gas burners (and flooring it of course).

Stop and go SUCKS, I've barely been getting 200 miles out of a tank because of all the traffic. Its no fun!

Stop and go SUCKS, I've barely been getting 200 miles out of a tank because of all the traffic. Its no fun!
That has been happening to me lately too. My last tank i go 230 and the one before that i got 195

I driven close to 300 miles straight at 75mph at night before in my '99 A4 and never got above 24 mpg.

My 2001 Corvette A4 got 28 mpg though and my Z06 got 30 mpg, all in pretty similiar conditions at night. The c5's were stock though and the F-body had LT exhaust intake programming and a thermo.

It never got below 17 though even in city and never going over 55mph. I think you calculations are right on, especially since your LT1 probably weighs about 150 more than my LS1 (100lb from engine and 50 from other crap I swapped for light weight).


Well actually there was this time I forgot to hook up my IAT sensor when I put a new intake on...

Yeah I got a little less that 10mpg when I did that...

Don't do that one. It also drove like really bad shit and sounded like crap.

After doing the throttlebody bypass and cleaned my intake and throttlebody itself i remeber getting almost 330-340 mi to a tank in my 96 LT1 A4 camaro. And that was with a 130,000 on the clock and mostly highway averaging between 90-100 every morning on my way home from work... i normally would get 310-320 though. I figured it would usually average 20-22mpg

As for the 94 right now I get about 14-16mpg when it hits on all 8.

it is all in how you drive though, coasting as much as possible to stop lights and stop signs, helps quite a bit too.

Think of it this way, everytime you hit your brakes, thats gas spent going nowhere. so tailgating or following anyone for that matter, you tent to use your brakes a lot more which in turn increases drag therefore having to use more fuel. Letting your car coast down hills and letting the car slow down some climbing hills by maintaining the same position on the gas up the hills means using less gas too.

If you program your car transmission to snap into 4th at a lower mph you might save more cash if you drive in 55mph semi-city/semi-highway (like 183 in Austin).

I programmed mine to raise gears as quickly as possible, it barely ever went above 2.5k with 3.23 gears. Almost never over 3k.

I get about 17-18 out of my M6 LS1 in all city driving, so that doesn't sound bad at all man.

I usually get 17-18mpg with about 70/30 split city/highway. I've noticed a big fuel consumption difference between 55mph and 75mph. Two fillups ago I got 13mpg with no highway. All that city driving is little to moderate stop-and-go too.

The gas gauge is odd too. I can often get 140 - 148 miles to the half way mark and then about 50 - 60 miles from the half way mark to "E". I've calculated that when the needle is on "E", there are about 2.5 to 3 gallons still in the tank which is the normal/common safety amount/feature in most cars.

ok thanks guys I was thinking that was what average, just wanted to make sure.

17 city sure would be nice. I'm getting around 14 right now. Running the heat seems to suck it down faster too.

I think I need a tuneup.

Ive got 26.46 mpg going between 85 and 105 in 6th gear on a loooooong trip.

Stop and go....gas milage takes a sh*t.

My car only gets around 14 or 15 mpg city driving and its a 2000 ss m6. It also seems to be worst in cold weather not sure why?

sounds decent to me ive had a smaller less powerful car and it averaged 16 driving like a grandma on easter sunday. 83 RX-7
Yeah, most rotaries I have seen do seem to run very rich.

I usually get about 17-18mpg in a 70/30 mix of city & back roads / highway driving. If I'm really getting on it and taking the RPM's up a lot, I get 16, but have never gotten lower than that. Last tank I took it a little easier and got 19mpg with the same mix of driving. I only took one long trip so far to visit family in Long Island and I think I got like 24-25mpg doing 80-90mph with no cruise on.

This is on a 2002 Z28 M6 with stock 3.42's (just lid & filter).

My car has a 3600 stall and 2.73 gears so in traffic I get horrible mileage because of the stall but on the highway the car will cruise at 70 at 1800rpm and get great mileage. Usually I average 17-19 mpg 50/50 mix of highway and traffic.

I usually get between 19-21 mpg in city driving around here. Of course, when I step on it, that number suffers. I haven't calculated highway mileage in a long time, so I'm not too sure about that.

My car only gets around 14 or 15 mpg city driving and its a 2000 ss m6. It also seems to be worst in cold weather not sure why?
In the cold, the IAT sensor tells the PCM to dump more fuel to the engine.....not totally sure why though, maybe someone can chime in as to why :)

In the cold, the IAT sensor tells the PCM to dump more fuel to the engine.....not totally sure why though, maybe someone can chime in as to why :)


Colder air is air denser air means more air which means the engine needs more fuel so it doesn't run lean.

Hence the reason I was getting 10-12 mph when I forgot to reattach my IAT sensor one day. I think it reads something like -42 degrees or something at max resistance (i.e. an open circuit).

Colder air is air denser air means more air which means the engine needs more fuel so it doesn't run lean.

Hence the reason I was getting 10-12 mph when I forgot to reattach my IAT sensor one day. I think it reads something like -42 degrees or something at max resistance (i.e. an open circuit).
That's what I was thinkin but wasn't totally sure......thx bud.....learn something new everyday :chug:

i went 310 miles in my z28 and the needle was not on E.