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Car Forum / Pontiac / Pontiac Fiero / October 2006Mileage
What kind of MPG can I expect from a Fiero? Are the 4 cyl any better than the 6? Mike, I can't comment on the 4 cylinder mileage because its been 20 years since I've owned one, but I can tell you what I've been able to get with my 88 GTs. My current car has done 32 on the freeway at least twice so far. Back when I had my first 88 GT the speed limit was still 55 MPH. Under those conditions I was able to squeeze 34 out of it once. The conditions of these mileage records were... Filling up at a gas station near a freeway on ramp, smoothly gliding out onto the freeway, slowly ramping up to 55/65 in the far right hand lane, and finally setting the cruise control to the posted limit. Then I would just take it easy until it was time to refill the tank. In regular daily commute/city driving you find yourself struggling to get as little as 28 MPG with a V6. I mostly get around 24 - 26. Martin > What kind of MPG can I expect from a Fiero? > Are the 4 cyl any better than the 6? The ultimate mileage fiero has got to be an 87/88 4cyl 5spd (not auto!!!!). I pulled a bit over 40mpg on a highway run. City was worse of course, but still not as bad as say an '86 GT with an auto and A/C (about the worst combo... hehe) > Mike, > I can't comment on the 4 cylinder mileage because its been 20 years [quoted text clipped - 19 lines] >> What kind of MPG can I expect from a Fiero? >> Are the 4 cyl any better than the 6? I've done 40-41 on few road trips (flat country and steady highway speeds) in our 88 4 cyl 5 sp > The ultimate mileage fiero has got to be an 87/88 4cyl 5spd (not auto!!!!). > [quoted text clipped - 26 lines] >>>What kind of MPG can I expect from a Fiero? >>>Are the 4 cyl any better than the 6? Phil is getting very good mileage (and no, I don't doubt you, I've done it myself as well, it's just that it doesn't happen often so don't EXPECT it). Normally, the 5 spd 4 cyl cars will get well over 30 and around 35 The 5 spd 6 cyl cars will get right at 30 The 4 spd 4 cyl cars will get just under 30 The 4 spd 6 cyl or the automatic anything will be doing good to average in the mid 20's. The lack of an overdrive really kills almost anything when you have to rev around 3000 to run 70 and that's what the stock autos and 4 spds do. OTOH, my Caddy 4.9 with an automatic 4T65E will consistently run 31-33 mpg at 70 mph. If I run closer to 80, it drops down to about 28 or so. John Stricker > I've done 40-41 on few road trips (flat country and steady highway speeds) > in our 88 4 cyl 5 sp [quoted text clipped - 30 lines] >>>>What kind of MPG can I expect from a Fiero? >>>>Are the 4 cyl any better than the 6? My 85 2m4 5 speed 170K miles was getting around 22 mpg I do not do much hiway driving and its no longer my daily drive. My new daily drive a 85 GT 6 cyl 4 speed 63K miles still only averages 17 mpg. So how would you go about improving that ? When I got that car 8 weeks ago I replaced the plugs, cap, rotor, oil change and gear box oil change and recently replaced the AIC as it was stalling that stoped. My tire pressure is good there are no error codes. I even tried for a week to be less lead footed but no change in mpg. Hank >Phil is getting very good mileage (and no, I don't doubt you, I've done it >myself as well, it's just that it doesn't happen often so don't EXPECT it). [quoted text clipped - 46 lines] >>>>>What kind of MPG can I expect from a Fiero? >>>>>Are the 4 cyl any better than the 6? Last thing first. For an '85 V6 4 spd that you don't do much highway driving, I'd say you're doing about average or just a little below, but not much. I don't know of many V6 4 spd's that will get over 20 in city driving, just not going to happen. I'd say that your 4 cyl. with the 5 spd is a little tired. It would probably do it some good to clean the injector in the TB and also be sure you set the timing since it's going to have a distributor. Back to your '85, since you asked how to improve things, I'd start with double checking everything. If you have access to a good scanner then plug that in and see what it's showing. Make sure your temp sensor to the ECM is reading close to what your gauge is reading. Also make sure that your Intake Air Temp sensor is showing something close to the outside temp. If these are off, the mixture is off by quite a bit until the ECM goes into closed loop. The EGR on these is also prone to some problems particularly getting carboned up. This problem will NOT set a code. There is nothing there to tell it that the EGR is leaking or not opening physically. The code is set by a switch in the EGR solenoid and just because it's sending a vacuum signal (or not) does not mean the valve is opening (or closing). These are pretty easy to take off and clean/replace but be careful to not break your EGR tube, they're like gold to go back to stock. Naturally, check EVERYTHING. Make sure your brakes aren't dragging, it's a lot more common than you think. I'd up the air in the tires for city driving at least 2-3 pounds over what the sticker calls for. Air Filter clean? Fuel filter clean? I've had good luck cleaning the injectors but I built my own cleaning tool. A shop can do it on the car and clean the fuel system very well. Make sure the timing is properly set on the car. If you have an aftermarket chip ("performance") take it out and put the stock one back in. For the stock motor, it's a very good chip. With all that in mind, around town driving kills mileage on a stick shift car, it really does. There's not much you're going to do to get your mileage with the 4 spd above 24-25 even on the highway at moderate speeds, it's just not geared for mileage. You can make sure that EVERYTHING is right, though, and get everything you can out of it. If the car were closer, I'd be happy to stick it on my wide band O2 and Snap On MT2500 Scanner on it so we could go for a drive to see what was going on. John Stricker PS: I have now, or have owned/done Fieros with: Stock 2.8 and auto 3.4 crate motor and auto 4.9L caddy with caddy auto 383 small block Chevy with 5 speed 4 cyl with 4 spd 4 cyl with auto 6 cylinder with 5 speed 3.4 race motor with Isuzu 5 speed from a 4 cylinder > My 85 2m4 5 speed 170K miles was getting around 22 mpg I do not do > much hiway driving and its no longer my daily drive. [quoted text clipped - 8 lines] > mpg. > Hank Yes I replaced all the brake pads and bleed them all off as the front driver side was really grabbing it better now, air filter is really clean I will continue to check out the other items. My guess is as it consistant at 17 mpg all is pretty good my understanding is they realy were not mpg cars and I really dont care as I love to drive it. My only concern is if its really under par maybe something is wrong with it. I dont know if the chip is aftermaker as I said I just got the car. I have a parts car a 96 maybe I will pull the ECM from it and see if there is a difference its a 6 with a 4 speed also. I cannot believe the power difference between the 4 and 6 cyl and I am still having trouble using te 4 speed vs the 5 speed. I am thinking maybe next summer finding a 5 speed or even swaping between the 2 cars. My location is Manchester NH. My 96 Jag XJ6 I ran it down this summer to L.I. NY it got 25 mpg highway it usually gets around 17 city. My web site with my cars http://mysite.verizon.net/vzeecixb/ Hank >Last thing first. > [quoted text clipped - 66 lines] >> mpg. >> Hank Hank, You know, this sucks. I just got around to checking the group and read your reply. Then I checked out your webpage. You live in Manchester. My wife and I just got back from delivering my '80 IHC Scout to it's new owner in Bedford on Tirrell Road. We stayed at the Courtyard over by the airport. I bet we weren't more than 5 miles from you. I guess I should check the group more regularly. If you see a really nice '80 blue/white top/white stripe Scout running around town, that's my old one. I wouldn't try to out run it if I were you unless you're packing some serious heat, for certain don't try to outpull it since it has a moderately built 392 fuel injected truck motor in it. John Stricker > Yes I replaced all the brake pads and bleed them all off as the front > driver side was really grabbing it better now, air filter is really [quoted text clipped - 96 lines] >>> mpg. >>> Hank Your right yur were less then 5 miles from my house being over by the arport and I work in Bedford. I'll keep an eye open for the scout. I have noticed driving along at like 35 or 40 mph 1500 to 2000 rpm 3 rd gear it is a bit jerky I am still getting in tune with this engine. My 2m4 I could alays tell if the sligest thing was actiing up and could get it back to normal but I am not as familar yet with the 6 cyl. Any idea as to why it is jerky like that ? Thanks Hank >Hank, > [quoted text clipped - 115 lines] >>>> mpg. >>>> Hank Hank, I'd check a couple of things for the jerk, or surge. Vacuum leaks can cause it if they're small and a bad or plugged EGR valve can do that as well, so that's where I'd start. John Stricker > Your right yur were less then 5 miles from my house being over by the > arport and I work in Bedford. I'll keep an eye open for the scout. I [quoted text clipped - 142 lines] >>>>> mpg. >>>>> Hank My 2m4 was getting average highway/city about 22 at 180K miles but the 85 GT 4 speed 63K miles I got about 2 months ago is averaging 17 miles per gallon. So whats up with that, besides my lead foot. O yes all I use is high test. Hank >The ultimate mileage fiero has got to be an 87/88 4cyl 5spd (not auto!!!!). > [quoted text clipped - 26 lines] >>> What kind of MPG can I expect from a Fiero? >>> Are the 4 cyl any better than the 6? depends I had a 4 cyl automatic that got much worse milage than my V6 standard 5 speed. How ever I guess Fiero made a 'milage maker' car, 4 cyl that did pretty well. MPG is suppose to be higher in standard transmissions, and the port injection is more efficient than the throttle body FI. Even tho the engine is slightly bigger, the V6, standard transmission cars seem to run circles around the 4 cyl ones. > What kind of MPG can I expect from a Fiero? > Are the 4 cyl any better than the 6? couldn't help but notice this thread but the gas mileage on fieros seems to be pretty low. i know that standards are better than autos on gas, so which is better on gas 4 cyl standard or 6 cyl standard. i always thought these cars woudl get better milage than what you've been saying because they're such small cars and they have fairly low horsepower, especially the 4 cyl > depends > [quoted text clipped - 10 lines] > > What kind of MPG can I expect from a Fiero? > > Are the 4 cyl any better than the 6? Seems to me my 85 2M4 automatic got about 22 mpg average. The 88GT V6 standard gets about 30 mpg with highway milage reaching about 36 mpg > couldn't help but notice this thread but the gas mileage on fieros > seems to be pretty low. i know that standards are better than autos on [quoted text clipped - 16 lines] > > > What kind of MPG can I expect from a Fiero? > > > Are the 4 cyl any better than the 6? ok so there's not much point in getting the 4 cyl if i were thinking it'd be better on gas. > Seems to me my 85 2M4 automatic got about 22 mpg > average. The 88GT V6 standard gets about 30 mpg with highway milage [quoted text clipped - 23 lines] > > > > What kind of MPG can I expect from a Fiero? > > > > Are the 4 cyl any better than the 6? I've gotten 28/30 MPG consistiently with my 88GT manual 5 spd and have owned it since 89. Regular tuneups, tire pressure (very important) ,and keeping on top of the problems should give you fairly similar results. I don't remember what the 4 cyl was getting (sold in 89) but I don't think it was that good. If you have a leadfoot then expect far worse MPG >I've gotten 28/30 MPG consistiently with my 88GT manual 5 spd and have owned >it since 89. Regular tuneups, tire pressure (very important) ,and keeping on >top of the problems should give you fairly similar results. I don't remember >what the 4 cyl was getting (sold in 89) but I don't think it was that good. >If you have a leadfoot then expect far worse MPG On long highway trips in my 2m4 auto, I was averaging 37mi per imperial gallon ( US gallon 29.6). I was hoping it would get 40 mi but that's the best I could get no matter what I did. Headlites up got less miles. They act like mini sails to catch the wind. Pete MY SC3800 5SP Formula used to get a little over 30 MPG highway but after I added the cam , did some head work and put on headers, I dropped all the way down to 29 MPG (again highway) >>I've gotten 28/30 MPG consistiently with my 88GT manual 5 spd and have owned >>it since 89. Regular tuneups, tire pressure (very important) ,and keeping on [quoted text clipped - 8 lines] > > Pete |
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