What kind of gas mileage do you get in your olds?

[72Cutlass]

I ask because I am trying to decide if I should rebuild my 350 or a 455 for my 72 cutlass. I only will be driving the car about 10miles aday or so, mostly in the city.

So any info from you guys would be great.

thanks

[J-(Chicago)]

10 mpg city

[don71]

I averaged 12.6 mpg. on my last tank of fuel. This is in my 71 with a tired old 455 with a 2:56 rear and a decent tune. My driving is mostly city, some rural but NO freeway speeds.

In my opinon, cars guys allways want more power. So I say 455 all the way. The difference in fuel economy is small but debatable.

[J-(Chicago)]

Agreed. both my 455, 350, and 307 all suck equally in this category

[kevinkpk]

I have a 70 delta 88 w/455/2bl. I have recentley spent some bucks on it, tune up including carb kit, distributor, plugs/wires everything. Understand I use at least 91 octane, I can get with air conditioning hiway, around 15mpg. City driving is around 10.

[Dapapadon]

My 66 Jetstar 88 w/ 330 2 barrel gets around 15 freeway and around 12 or so mixed driving. So the big blocks do as well.

Don

[Jokers69]

what???

[W30post]

455, 200 4R overdrive and 3.42 gear. Decent tune with 2.5 inch pipes. I run a 26 inch tall tire and I use lock-up when the car achieves 4th gear. I get 15.5 mix driving. I haven't been on the road enough to know highway MPG.

[2blu442]

OK, how many of you guys can remember the gas shortage of the 1970's? I drive like an old man most of the time as I learned how to drive with my Dad telling me there's an egg between my foot and the gas pedal... don't break it! The blue car with a fresh 455 4bbl, TH400 and 2.56 gears got high teens on the highway all the time. One trip with four adults in the car and the trunk full of luggage three tanks averaged 21 mpg on regular gas in the 1980's. Later I took that engine out to put in a 1970 442 and installed a 350 4bbl that had been recently rebuilt. Same trannie and rear end got 17-18 mpg on the highway. My job at that time had me traveling throughout Oregon and Washington State so in one summer I put 30,000 miles on the car and that's the consistant milage I got. No idea on city driving, but on the highway with normal driving the 350 and 455 got about the same milage.

[canucklehead]

Gas mileage sucks especially useing the high octane fuel.What really matters is are you haveing FUN driveing you Cutlass?

[Cecil Anderson]

Just have fun driving, Petrol here in England runs around $11.00 a gallon. for the cheap stuff.. 97 over 1£ leter. Andy/

[Modern Motoring]

I get many sMILES per gallon in my 63 98 convertible!

[Oldsguy]

I don't care about mpg because my Oldsmobile isn't going to be a daily driver, but my experience tells me probably would be below 15mpg.

[VWBeamer]

Hi :-)

i just got a 77 oldsmobile cutlass 2dr with a 350 in it. It gets 12.5 mixed. this seems a little low.

I made sure the vacuum advance was working, and the carb was recently rebuilt. At idle i think i hear a little miss, maybe a fouled plug or leaky valve?

my other car gets 45mpg and is faster, but i like driving the cutlass.

[J-(Chicago)]

Ugh.... don't remind me.

[Redog]

Delta appox 8 to 12 city/highway

Alero 19 to 21 city and highway, 18 to 20 city only, 32 to 35 highway only.

Yes that's right, I can get upto 35 MPG highway with my Alero. That is why I laugh my ass off at commericals for 4 bangers getting 30 to 35

[Lady72nRob71]

Lady got 19.9mpg average during her 1500 mile trip from Georgia to TX, even going though the Blue Ridge and Smokey Mountains and doing 80 though the flats of TX.
She has a 350 4bbl, TH350, and 2.73 gears (I think.)
Puttering around the city has been considerably worse.
If I rent a std suv or a minivan when on vacations and drive the same distance, I get the same avg mileage of 20 with their little V6s.

My Harley gets 58mpg combined city and highway, so there is fun on both ends of the scale!

I think my '86 Cutlass with its 307 and TH200R4 gets around 20 in the city, but not for sure. She does not come out much.

It is all in the fun / style factor. If you can afford it, try not to think much of it (thats what I tell myself...)

[Gert3116]

I have a 69' Cutlass with a 350 4barrel/ I'm not exactly sure on the mileage, but I think it gets around 14 on the highway, and about 10 or 11 in town, maybe less.