When I was in in Webster/Rochester area, I had a chat with Fierobug about fuel economy/mileage. I wasn't able to do the unit conversion on the spot, since I use L/100km -- also, our old system used a proper gallon, instead of a US gallon
That said, I've had some time to do the conversions, and wanted to reach out to see what other people are getting in the real world, as opposed to "theoretically", or "once downhill with the wind at my back". I track every tank with Fuelio on my phone.
My overall average is 9.14 l/100km -- 25.7 miles per US gallon. This covers 17 fill-ups between April 08 (my first fill-up) to June 19 (my most recent fill-up), spanning 5627 km (3496.5 miles). (I've done a couple of trips, and tend to fill up before/after, even if I'm not empty).
This is trending down (or up, for your US units), though. My early fill-ups were in the 10-12 range (23.5-19.5), while my most recent have been in the 8.1-8.5 range (29-27.5). I think some combination of winter gas and new-to-me driving is to blame
As an aside, the topic of engine speed was brought up, as my 5-speed may have different results than an automatic. On my drive home, the max speed I hit was roughly 110km/h, or 70mph. Engine around 2300-2400 RPM (presuming the tach is accurate).
Is this in-line with what everybody else is actually getting in the real world?
86 2.8 auto --- around town 19 - 21 ----- highway trip back from Carlisle (150 miles each way speeds 55- 80) about 25. Running with a friend who has a 3800 sc (5 speed I think) He got 35+. Need to repower soon I guess.
With my 2.8 5 speed there is a wide range of mileage depending on driving conditions....so naturally the % of city/highway will make a big difference. The best I have seen is 32....5th gear cruise control for the whole tank. City driving..(spirited city driving, some might say) gets a mileage of 19!!
My 86 gt 4 speed muncie is getting very strange fuel economy. Not that im complaining but somehow I am able to get 28-32 mpg which I thought was very odd for the 4 speed. This mileage includes highway (coasting at 65?) and sometimes dropping the clutch at stop signs. I am using premium 91 along with an injection cleaner ever 3-5 thousand miles.
86GT auto 27.5 – 31 MPG I picked up 3+ MPG when a new Delco coil was installed. The coil breaks down so gradually that you don’t notice until it is replaced. Then it was like wow where was this power hiding. On the first startup after adding the new coil the idle RPM was 400 higher until the ECM dropped it back to normal. Only problem I have now is with that extra kick I have a major problem with my right foot. It just feels soooo… good.
This is trending down (or up, for your US units), though. My early fill-ups were in the 10-12 range (23.5-19.5), while my most recent have been in the 8.1-8.5 range (29-27.5). I think some combination of winter gas and new-to-me driving is to blame
It stands to reason that your mileage is better now than it was during the winter. Cold engines use a lot of gas.
86 2.8 auto --- around town 19 - 21 ----- highway trip back from Carlisle (150 miles each way speeds 55- 80) about 25. Running with a friend who has a 3800 sc (5 speed I think) He got 35+. Need to repower soon I guess.
Do the 3800 sc's really get that good milage? May have to consider the swap just for economy alone
My driving is about 75% highway/25% city. Over 30,000 miles and 3 years I'm see about 27MPG. It goes down a little in the winter. I also saw a 1-2MPG increase after my coil failed and was replaced with a new one.
------------------ Black '88 Fiero Formula, 5spd Getrag, Pretty much stock, but big plans for it!!
Also take into account if you are using real gas or 10% ethanol, and what octane. Mine was 87 octane 10% ethanol becuause its hard to find real gas up here and it costs 30-40 cents more per gallon when you do.
Since my 85 GT has over a 100k on it do you think it would be a good idea to replace the original coil as a matter of maintenance and if so should I go with a stock one or an MSD coupled with new wires? Thanks
Since my 85 GT has over a 100k on it do you think it would be a good idea to replace the original coil as a matter of maintenance and if so should I go with a stock one or an MSD coupled with new wires? Thanks
Id say it would be a good idea to get one and keep in in the trunk, or you could replace it and keep your old on in the trunk. I have used the MSD, but I dont know if they are actuall more powerful or not. Yep wires and plugs too as general maintinence.
Try a MSD Streetfire coil with FS STI 7.5mm wires. They work great as a stock replacements. Three years with them here, no problems, runs great. Getting 32-33mpg highway, 70mph, 2.8, getrag, cruise on.
Just guessing about 24mpg with overall spirited driving, everyday cruising, highway mix. Regular gas (10% ethanol), mild weather driving.
[This message has been edited by Kevin87FieroGT (edited 06-27-2014).]
I have been plotting my 87 GT 2.8 with 5 speed since 2007. Mixed driving, mostly SC, NC, GA and Tenn. mountain roads. 35 tanks Average 24.80 MPG Harry (Age 75)
[This message has been edited by HarryT (edited 06-28-2014).]
My old 2.8/Isuzu would get 24-26 mpg on my daily commute (19 miles each way, mostly curvy 2 lanes with about 10 stops) and 32-33 mpg on the interstate.
