Whats your MPG with your set up?

[BLK95-Z]

Im pulling the motor in my z and getting parts together to rebuild. Ive never blown up an LT1 before but this one is making a death noise. Im not wanting to go crazy just a stock rebuild with better pistons and a cam. I want a motor I can drive 2000 miles on vacation and not be killing me on gas but still take to the track. Maybe 350-400 whp all motor?

So my question is what kind of MPG would I be getting with a mild to large cam, some mild porting and slightly raised compression? Of course it will have headers, a good tune, its a M6, etc... What kind of numbers are you guys getting with your set ups?

Oh yea Ive got 4.10 gears also...thanks!

[thumpinglt1]

right now with the cc503 im getting 17mpg untuned.. going to get a tune in 2 weeks

friend of mine with cam and ported heads got 27 hwy mpg tuned

[BLK95-Z]

Thats about the size cam Im thinking of running. I would think with some tuning you could go from 17 to maybe mid 20s...and that would be fine with me. I realize city driving is always going to be crappy if your making any power Im talking about 6th gear 75mph highway.

[Phstratton]

Lol, I'm getting like 12 with a cam, heads, and a tune.

[BLK95-Z]

Lol, I'm getting like 12 with a cam, heads, and a tune.
lol wow thats pretty bad, Ive never had a internally altered engine before is the reason why Im asking. I dont want to mod my car if its going to make me get 12 mpg. Thats what I would expect a lightly modded carbed car to get. I realize adding mods makes it less efficent but its still fuel injected. How much power are you making?

[RoboLuke]

Bolt ons. About 20 city / 26 highway.

I've known people to get upwards of 30 highway on a bolt on car.

[Tbird232ci]

Something must be wrong with my setup. Long tubes, full exhaust, 1.6rr's, LT4 springs, air foil, LT4 Knock Module, and a few other odds and ends, and I average 17mpg city/highway.

[proace4]

i have a small cam and comp springs. gmpp 1.6 rr's. hooker mids and slp loudmouth. SLP CAI, A4 with 4.10s and a pretty good tune and i get aound 18ish (depending on whats on the street) in town and i get on average 24 on the highway. but it is kansas and roads are flat! cruise control at 2700 rpm = 67 mph.

[popo8]

20/30 just an average, and thats with the 4.10s

[19mike84]

i never have made over 230 miles on a tank a gas.... i have this problem with my right foot getting stuck to the floor

[joelster]

I get about 8 or so, not that I care though. If I want to drive it I usually have to put $20 in it. I just putt around town with it though. My blue car LT1 T56, gets mid 20's.

[BLK95-Z]

Looks like every one making some power has the worst milage witch would be expected, with the exception of Popo. Looks like forced induction gives you power and fuel economy, I just dont have the $$ for it. Maybe he just obeys the law and never gets on it :D

I guess since this is my first build Ill keep everything mild, I really dont want to have to put $20 in it every time I drive it. Any suggestions on a cam that works well with bolt ons but doesnt drink gas?

[KissMyWhtSS]

Bolt ons. About 20 city / 26 highway.

I've known people to get upwards of 30 highway on a bolt on car.

I've gotten 29 in my car before, and I know of people getting 31+ I don't do highway roadtrips in my car much so I usually get 26-28 highway. Your 20 city is pretty impressive though -- is that purely city or combined?

[RoboLuke]

I've gotten 29 in my car before, and I know of people getting 31+ I don't do highway roadtrips in my car much so I usually get 26-28 highway. Your 20 city is pretty impressive though -- is that purely city or combined?
It's mostly city. I haven't calculated it in awhile, since I don't drive it a whole lot once I get to school. When I do it's usually just a few blocks away since Stillwater isn't very large.

[KissMyWhtSS]

It's mostly city. I haven't calculated it in awhile, since I don't drive it a whole lot once I get to school. When I do it's usually just a few blocks away since Stillwater isn't very large.

fair enough, I've never been to Stillwater, just Tulsa. I live in a very urban city where theres a stop light every 100 feet. I don't do too bad (15-16 MPG) but I'd love to get 20. I get about 20-22 when I do about 33% highway, 67% city)

[95formula383lt1]

with my mods and un tuned (the 95 formula at the top of my sig H/C/I car) i get about 200-220 to a tank.

[Z28pr0jekt]

With bolt-ons I was getting 22/31
Addition of the cam I was getting 15/26

[joelster]

My cars power doesn't have everything to do with the mileage. My transmission does though. A 5200rpm converter tends to use up gas a little bit, lol.

[AChotrod]

I have no idea but Im sure its not great.

[bluebird94]

My trip meter stops at 9 so I have no idea really. My car tends to last longer than Sabaktes' though.

.. my gas gauge is broken too :(

[DopdBrd]

Stock 97 Formula M6 28-29 MPH HWY
LT's, ORY,Exhaust, CAI 29-31 HWY

LE2 96 Formula with 4.10's M6 24-26 HWY
236/242 Cam, big heads 4.10's M6 24 HWY

I've always gotten decent MPG's with my cars. The new setup suprised the heck out of me for sure. That 24 MPG HWY is also UNTUNED!!!

[Silver Bullet]

i get about 19 to a galloon

[SGT_WRIGHT]

13 city
18 highway
Average numbers...had as good as 15 in city and 20 highway...but has been getting better.

[KissMyWhtSS]

I've always gotten decent MPG's with my cars.
Tell them what the Silverado got pulling the trailer. :tt2:

[DopdBrd]

Tell them what the Silverado got pulling the trailer. :tt2:

Hey now, I said CARS!!! LOL my truck is a gas whore, I'll admit that. But of course I didn't mention what my car gets in town, lets just say my trucks 13MPG is better than what it gets :(

[BLK95-Z]

Hey now, I said CARS!!! LOL my truck is a gas whore, I'll admit that. But of course I didn't mention what my car gets in town, lets just say my trucks 13MPG is better than what it gets :(

You guys aint lieing lol Ive pulled trailers with all kinds of different trucks at work and it seems to me gas engine trucks are always horrable pulling anything. Diesels get great milage on the highway and you cant tell your pulling anything

[DopdBrd]

I was pulling a 28ft enclosed trailer with my dad's crew cab GMC 5.3. It got around 8 MPG on the highway!!! I want a Diesel, but just don't tow enough to justify the price of one.

[TorqueAddict]

i get like 14-15 in town and like 19-20 highway(if i keep my foot out of it which isnt much)

[roadrocket]

12.30's@26mpg :D

[CALL911]

I have gotten as good as 21 MPG on the highway with my Z28 in my sig, and if I am a lot of WOT then about 10 MPG. I average about 15-17 MPG.

Get this though; in my Formula in my sig, I average about 9 in town and 19 on the highway (about 14 on average).

I still don't understand sometimes how my 200+ RWHP car gets better mileage than the less powerfull one.

[Pro-jection Eng]

i'm running E85... I think the last 10 gallons before my car got torn down lasted about 140 miles... and that was 100% highway running 9.7-9.8 A/F :) in the city i probably get about 8 mpg

[BLK95-Z]

i'm running E85... I think the last 10 gallons before my car got torn down lasted about 140 miles... and that was 100% highway running 9.7-9.8 A/F :) in the city i probably get about 8 mpg

I may have been under a rock when this was discussed but why are some of you guys running E85? Is it our alternative to run with all our sensors instead of leaded race gas?

[proace4]

I have gotten as good as 21 MPG on the highway with my Z28 in my sig, and if I am a lot of WOT then about 10 MPG. I average about 15-17 MPG.

Get this though; in my Formula in my sig, I average about 9 in town and 19 on the highway (about 14 on average).

I still don't understand sometimes how my 200+ RWHP car gets better mileage than the less powerfull one.


lol its because your powerful one is a camaro!!! my car has always gotten better gas mileage than my buddy's ls1 ws6... pisses him off! lol

[CALL911]

I may have been under a rock when this was discussed but why are some of you guys running E85? Is it our alternative to run with all our sensors instead of leaded race gas?

Not really sure why anyone would want to run it on an N/A car. Personally I wouldn't really use it on an FI car, but if tuned correctly it can be an alternative to race gas.

Personally seeing it do its corrosion damage and destroying some pumps, and then getting lousy mileage with it, it ends up not saving anything IMO.

I like the idea of meth injection and intercooling instead of race gas for FI, but if I had to pick between spending the big $ on race gas vs E85, I would still rather run race gas. But I know some that have choosen to go that route.

[BLK95-Z]

Not really sure why anyone would want to run it on an N/A car. Personally I wouldn't really use it on an FI car, but if tuned correctly it can be an alternative to race gas.

Personally seeing it do its corrosion damage and destroying some pumps, and then getting lousy mileage with it, it ends up not saving anything IMO.

I like the idea of meth injection and intercooling instead of race gas for FI, but if I had to pick between spending the big $ on race gas vs E85, I would still rather run race gas. But I know some that have choosen to go that route.

but doesnt race gas foul the 02s? What do people generally run for fuel if you have a very high compression fuel injected N/A setup?

[CALL911]

Premium usually does the trick for N/A. Although if the setup is so high (probably track only car) that it requires higher, then I would imagine race gas.

Mostly the guys who need race gas or meth injection are the FI guys or guys running N20 that need the extra octane to keep them away from detonation than just N/A cars.

To my knowledge, race gas does not foul out your O2 sensors. Its just damned expensive and thats why most try to find alternatives to using it.

[Z28pr0jekt]

Premium usually does the trick for N/A. Although if the setup is so high (probably track only car) that it requires higher, then I would imagine race gas.

Mostly the guys who need race gas or meth injection are the FI guys or guys running N20 that need the extra octane to keep them away from detonation than just N/A cars.

To my knowledge, race gas does not foul out your O2 sensors. Its just damned expensive and thats why most try to find alternatives to using it.
To add to this, LEADED race gas will junk up and ruin the O2s if used often enough or the O2s are old.

But unleaded race gas is nothing more than higher octane gasoline.

If you are not tuned for the race gas and use it, cars tend to run more rich with it (hence why it eliminates knock due to too much timing) and running excessively rich can foul out the plugs/O2s

[CALL911]

^ True statement.

[Neil350]

Maybe 8?

Stock it would get 12-14 city, 20 highway

[StorminMatt]

So mid-20s on the highway is about what can be expected from a relatively stock LT1 Camaro with T56? If this is true, then my 240SX will probably do better on gas with the LT1 than with the stock KA24DE! The KA24DE might be just a 2.4l four cylinder engine. But it is NO gas miser. If you get 27MPG on the freeway with that engine, consider yourself lucky. I just have to wonder where all that gas goes with that engine.

[hbgben]

To add to this, LEADED race gas will junk up and ruin the O2s if used often enough or the O2s are old.

But unleaded race gas is nothing more than higher octane gasoline.

If you are not tuned for the race gas and use it, cars tend to run more rich with it (hence why it eliminates knock due to too much timing) and running excessively rich can foul out the plugs/O2s
Unleaded race gas can usually be found at or near 100 octane. In SE WI by me is $6.4x per gallon. wasn't all that bad a few years ago when gas here was average $4.3x for 87 octane.

[hbgben]

As for mileage, I have a 6-speed with mods in sig and I average 25 or so on hwy drives and about 20 or so when i'm in it. Pretty good actually.

[chevrolet423]

my best was 32 on the highway.. just bolt ons

[hbgben]

my best was 32 on the highway.. just bolt ons
what elevation are you?

[KissMyWhtSS]

what elevation are you?

Per Wikipedia: Elevation above sea level is 4,658 feet. (Greeley, CO)

[chevrolet423]

Per Wikipedia: Elevation above sea level is 4,658 feet. (Greeley, CO)

ya thats pretty much the elevation here... i got that on a trip to the mountains last summer, but then again i was trying to get the best gas mileage i could possibly get

[Captain Dirtymax]

the LT1 - 21mpg in town (very best i got, and it never went over 1800rpm), worst was 13mpg (first week i had it lol:devil:), so far i've been around 19mpg in town with an auto 3.23 posi car.

Duramax - 24mpg cruising 55mph. 15mpg @ 65mph with a 9500lbs/28ft travel trailer. not bad for an 4 ton pig (8122lbs exactly with me in it and a full tank).:D

[Zlow28]

11 MPG FTMFW!!!!! :driving: A4 stock with a heavy foot. All city.

[Firebirdjoe]

I only get 180 miles to a tank with just bolt-ons... I think i have a problem...

[NoMoneyZ]

Bolt ons, tune, and 4.10's with A4, I average 12-14.

My DD f150 averages about 10-11. Stupid 5.slow

[Camaro_94]

Something must be wrong with my setup. Long tubes, full exhaust, 1.6rr's, LT4 springs, air foil, LT4 Knock Module, and a few other odds and ends, and I average 17mpg city/highway.

Are you M6 or A4?

My A4 was a pig on gas. I would average 19 on a good week with it.

[Tbird232ci]

I'm a M6.

Since my previous posts, I pulled my plugs, and re-gapped them, and fixed a vacuum leak. I drive about 60 miles a day, in rush hour, and average about 19-20mpg mixed as of lately. If I stop at a cheap gas station with lower quality gas, I get about 17mpg.

I keep getting an intermittent code for O2 sensors, so hopefully those will help me a bit too.

[1FASTSS]

9-12mpg

[AChotrod]

I have no idea nor do I care. All I know is its not that good:jest:

[razor02097]

17mpg.... however the potential is there for a lot better mileage.... I just can't keep my foot out of the loud pedal long enough to find out... :shiner:

[spina74]

I was making 16city/20highway, with the parts in my sig

[Young Maro]

I'll probably be getting around 12 with my 383 build.