GAS MILEAGE CHANGES SIGNIFICANTLY

2005 Cadillac CTS

Tiny

rickysh11

July, 11, 2011 AT 6:21 AM

When I fill my car with gas the DIC displays the estimated amount of miles that it can have with the gas was put in, but for some reason the miles range changes significantly lower with only the passing of a few miles. I.E. The DIC would read 186 miles range, then after driving for about 3 to 4 miles it would read 96 miles range. Why would this be? I've recently had the ECM re-programmed by the dealer but I have had a check engine light reading that shows the catalytic converter being faulty and I also have custom wheels if that would make any difference.

FOUND 16892 RELATED QUESTIONS

2 Answers

Tiny

mhpautos

July, 11, 2011 AT 7:32 AM

This will be still a problem with the ECM, I would take it back and explain the problem, they may be able to do a re flash to fix the problem.

Tiny

factoryjack

July, 11, 2011 AT 3:10 PM

The custome wheels should not make a difference on the range. What is the accuracy of the fuel gauge itself? There are some issues with fuel transfer from saddle to saddle, affecting fuel remaining, and therefore affecting range.

Please login or register to post a reply.

Code Read Retrieval/Clear Chevrolet Camaro
Code Read Retrieval/Clear Scion XD
 Step by Step video GMC Yukon XL 2000-2006
Read Codes Like a Pro
Code Read Retrieval/Clear Mercedes-Benz C230
Code Read Retrieval/Clear Mercedes Benz