Only getting 21MPG Highway, suggestions?

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Jul 17, 2007 | 04:32 PM

#16

The Captain

Thread Starter

Registered User

Joined: Feb 2003

Posts: 649

From: Champaign, IL

Just had to refuel again today, Only got 217 miles out of the tank 60/40 highway/city driving, which equates to 14.6MPG

Jul 17, 2007 | 07:11 PM

#17

TobyZ28

Registered User

Joined: Aug 2002

Posts: 2,325

From: BC

Get a scanner on the car and watch for knock retard. Your cutout being open all the time may be causing the engine to retard timing reducing your milage drasticaly.

Jul 17, 2007 | 08:36 PM

#18

elisowski

Registered User

Joined: Sep 2004

Posts: 271

From: Canfield, OH

Quote:

Originally Posted by The Captain

No o2 sensors on the 93s, it is an A4 and shifts perfectly, car runs fine, it will get up and go with no hesitation or anything. As far as I know, it still has the factory plugs and wires. It is throwing a code 26, which is the EVAP system, but I wouldnt think that would hurt fuel economy too much

The cheap cone air filter looks like it could use a cleaning, but its really not that bad.

If the EVAP system is broken, it could draw clean air into the manifold (vacuum leak). The MAP sensor will read a higher MAP value (lower vacuum)and ADD fuel because it "thinks" you have the throttle open more than you really do. Adding the fuel will cause you to run rich (burning more gas and eating into your mpg) and foul the plugs (poorer combustion).

I'd have the code checked and fix the problem. Then clen or replace the plugs. It could be the cause of your lower fuel mileage.