What is your gas milage for those of you who run 350's?

Edit- wow, I just noticed I forgot the "r" in your...I feel pretty stupid right now.

 

Funny you forget the R as I assume you mean what kind of mileage does the typical 350R here get.

While my only input would be my carb'ed 350X gets 15-18 hauling around 4000lbs

Doesn't really matter how I drive, it drinks it down.


Might wanna include carb or FI in results.

 

5 mpg on a good day!!! And it is sad because im serious

 

Yea it depends on alot of things. Mainly what carb (of FI) system your running, what kind of fuel pressure you get. What rear gear, tranny??? Alot of things come into play. My car was running dual 650 carbs, with holley electric fuel pump, it got from one gas station to the next. Now its running a q-jet, gets me from one end of town to the other and back, on about 1/2 tank of gas. Its overdrive auto, and 373 rear.

 

My L98 GTA thats stock except for the slightly oversized injectors (24LB) will only go about 185-200 on a tank.The car runs super rich because of the injectors.

 

I'm running a crate 350 with with a 750 Edelbrock 4 barrel (need to rebuild and install the Q-jet), T5 transmission, and a 3.73 rear end. I also drive her like I stole her. Result: about 10 miles/gallon. She is definately not the daily driver.

 

Motor specs in sig, but in short, a 350 with a compxe268, no overdrive, 3.23 gears, and ported 305 heads, with a q-jet and performer RPM manifold, 275/60/R15 tires out back.

20 MPG on highway
probably around 12MPG in town.

Keep in mind, that's a 3000+ RPM cruise speed which is killer for mileage, and i've got more tuning to do on the q-jet yet.
Nice thing is, I don't have to downshift to pass someone, just roll onto it, and i'm blowing past them like they're standing still

 

ZZ4,650DP,700R4 and 3.42s=11mpg when I just cruise with a conservitive foot on accleration.Less then 5 when the secondaries open up.My brothers 90 L98 vette gets about 16-18mpg with just a few bolt-ons around town.

 

350, bored TBI intake, 2" TB with #50 injectors, T5 3.08, 10 bolt rear, 225/65 tires.

I'm running really rich right now but i get around 15mpg around town and 25ish on the freeway.

 

right now i get 0 mpg, because it is winter, and i dont drive it in the winter, but in the c summer: city 18-19 mpg, highway about 25-28 mpg. stock L98 with some bolt ons. got a bunch of goodies on the way after x mas. i also drive like its stolen!

 

Hey another Winnipegger, wicked, I get about the same gas mileage as you. 17mpg city avg and 25-26mpg hwy. I have no mods what so ever though and a fresh tuneup every year.

 

yea man, winnipeg is wicked. sunday night! anywho what kind of car you running? you ever seen my TA zippin around?

 

I am running a 350 bored to a 357. It is TPI.

 

Mine is bad to worse...

To tell you the truth i dont even want to know my MPG!

One thing i can tell you is it has no problem gobbling up a couple hundred in gas in a night


Oh well, gotta pay to play!




Its not too bad if im just putting around or just driving to work and back, then its real easy on gas. this motor has got alot of bottom end grunt so it doesnt take much throttle at all for granny driving!



Edit: holy crap, just did a quick calc...

Just driving to work and home, 5km each way x4 per day. i get about 10 days worth on a tank...

5km x 4 = 20km a day x 10 = 200km

200km = 120m +/-

120m / 16gal tank = 7.5mpg

And thats when its really, really easy on gas!!!!

 

8-10mpg around town.

 

350, Ported 305 heads, Crane 272H10 cam, 700r4, 3.07 gears, P295/50/R17s all in a 5,300 lbs van. Averaged 17 MPG over the last 1,500 miles about 30% city, 70% highway.

 

So, Fast355, Are you planning on dropping your engine into a 3rd gen or are you going to keep it in your van? What are your plans for it?

 

I have a 350 that is going 396 on my engine stand. Dart 180 heads. Nice roller cam, etc. One of the other is going to go in a F-body or G-body. I really like the mid 80s Monte Carlo SS. I also have a soft spot for the early 90s RS Camaros. The Van is here to stay. Its not going anywhere anytime soon.

 

l98 with small cam and running alittle rich, I get close to 200 on a full tank a gas, with about 50/50 highway/city.

 

So I was hoping to find some reinforcement that my new purchase's (87 IROC-Z Z28 w/ a 350) 9mpg city and 12 highway was a problem that could be easily fixed. Seems to be pretty normal. Crap

 

My L98 with TBI, 5 speed, 3.73's .... averages on fillups 18-19mpg, I've never done city or highway MPG checks but this is what it comes up to on each fillup. But I am about 50-50 city and highway

 

i have owned 3 L98 auto formulas, 1 stock, 2 with mods. also 1 5spd with transplanted L98. fuel used = $$$$$, fun i had using the fuel = priceless
calculated mileage ???

 

I guess I get great milage compared to most people. Going to and from work (75% highway, 25% city), I get right around 20mpg. This is from a fairly modified tpi 350, 700r4 and 3.23 gears. It has enough power that I once out-accelerated an LS1 6speed Z28 at slow and high speeds.

 

NO, that's not normal. Unless you're leaving 10' of black tire marks at EVERY stop light/sign and cruise at 80mph on the highway, something is wrong there. Check O2 sensor, check for plugged cat, clean injectors, etc etc.

 

I get 18-19mpg on the street, 23mpg or so on the highway.
Mild built TPI L98, 081 305 heads, cammed a tad with headers

It's just getting cool here in Arizona, ultimate cruise season!

..ALL WINTER LONG, muhahaha!