[This message has been edited by Gall757 (edited 08-07-2020).]

[This message has been edited by pmbrunelle (edited 08-07-2020).]

Might also depend on local fuel supply. Here in California most stations have different blends for "summer" and "winter", one having more alcohol or other additives which can affect economy. (No idea what you get there, never mind how the octane ratings compare

Also for cars this old the transmission type can have an effect, ie the automatics prolly do worse than the stick.

Mine was doing about 17L per 100km when I bought it, even though I drive like an old lady. But, that was driving around town only, with the aircon on in California summer, and as I recently discovered, with the parking brake dragging badly I'm hoping that will materiall improve now that the brakes are only stopping the car when I use the pedal

Point is that there's a lot of variables, so don't assume any one number is absolute. Make sure your car runs well (and the parking brake is adjusted properly!) and then enjoy it.

-- A

[This message has been edited by dremu (edited 08-07-2020).]

[This message has been edited by Patrick (edited 08-07-2020).]

Actual Octane is about the same in other countries as US but only RON number is "advertise" that's make people think is Higher.
Mostly Cover here... http://www.fiero.nl/forum/F...HTML/122420.html#p16

Stock Fiero should have ~ 91 RON gas minimum in EU Japan etc. Running higher octane can hurt consumption.

Yes, How and Where you drive affects Fuel Consumption and the exact formula of gas too.
You need "Pure Gas" to "E10" = 10% Ethanol or less for most vehicles not made to handle "Flex Fuel." FF Vehicles can run straight gas to E85 and have sensors to adjust timing etc to handle whatever ethanol in the tank. (⚠️ Running "RV" or Marine dyed gas in street vehicles is illegal in many places because of Taxes.)

The "best" MPG/KPL happens on the Highway on fairly level ground at constant speeds ~ 55 - 65 MPH. In the right conditions you might actually see or beat advertise EPA etc MPG rating here but only on a long trip w/ no traffic problems.
The "worse" is "around town" or stuck in slow traffic on a highway because Both can make you stop and shift a lot. Auto Trans can't lock the TC making worse MPG in these cases but Stick cars w/ most drivers aren't much better.

Older EPA MPG rating and related for "city" and "highway" driving are a wet dream at best at some lab/factory for 99+% of cars. After EPA and others charge some rules to get a rating in 2008 and again in 2017. IOW you can't compare older MPG ratings for most 2016 and back cars w/ new cars w/o help because old pre 17 and very old pre 08 ratings was worse.
Even new rules and advertising for MPG ignore E85 because any vehicle using that will Never see the rating numbers.

EPA ratings are at https://www.fueleconomy.gov and https://www.fueleconomy.gov/feg/findacar.shtml
Many should see close to the Combined number at best even if you drive on the highway. More so if you use new rating...
The site has the help needed just above w/ a page Compare Old vs. New EPA MPG https://www.fueleconomy.gov/feg/compareMPG.shtml (currently covers 1984 to 2016)
Example: https://www.fueleconomy.gov...shtml?words=#id=1720


------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

[This message has been edited by theogre (edited 08-07-2020).]

------------------
Mike in Sydney