Why would my 97 neon only get 17 mpg - 1997 Dodge Neon

carburetor needs cleaning, your jets are probably clogged. replace fuel filter (inline) and check egr valve

- The 1992 Buick Regal has an EPA estimated city efficiency of 16 - 17 MPG and an estimated highway efficiency of 24 - 26 MPG. https://dot.report/vehicle/Buick/Regal/1992

Hi, here you go:
Miles Per Gallon
City: 15 MPG - 17 MPG
Highway: 18 MPG - 19 MPG
Thanks! EJ

Published performance of the 2000 Dodge Neon is 27 MPG (Miles per US Gallon) for mixed City/Highway driving which translates to 8.7 Liters per 100Km.

Hope the information is useful.

MPG (city) 15
MPG (highway) 21
MPG (combined) 17
4WD

It's the tranny. Trust me on that,no cheap fix.

That's only 17 or 18 MPG/U.S. Gal. Not very good for a Neon. When was engine serviced last, as in air filter, oil filter , oil change, and perhaps a scan for any trouble codes? What type of driving conditions?

The better the engine breaths the better the mileage. Was the new computer a stock computer or performance?

Your fuel mileage is about 24.8 MPG.
Your 1997 Neon is reported as getting between 25-34 miles to the gallon (depending on driving conditions)
Do you do a lot of city driving, or highway?
Do you jet around everywhere (like me) or drive like someone's great grandmother?
If you do a lot of the former, you're actually getting good gas mileage.. a lot of the latter and .. well.. check your fuel tank for leaks.

You have to bring the hydrogen in after the airfilter and before the mass flow air meter and you will not have to mess with the oxygen sensor.

Power to your hydrogen sensor should only be applied when your fuel pump circuit is on and in addition to that you should have yet another manual switch after that with some sort of armed light to let you know your are making hydrogen.

There is a guy here in Austin with a Ford windstar van that has done this and gone from 19 mpg to 30 mpg.

All of this is done at your own risk.