Tim Bevan Posted November 19, 2014 Report Share Posted November 19, 2014 what could cause lower than normal avg mpg on any car (mine is a 1990 cadillac fleetwood) the digital number will jump around but usually fall around 9.5 i have filled up my tank completely and reset the avg mpg but it came back to around 9. someone told me that 1- my fuel injectors could be partially clogged. 2- that cadillac sell (only at the dealership) some can of fuel cleaner, like the cheap stuff at autozone. to preform the same task. is this true? also could things like map sensor/fuel filter cause me to lose mpg? Any help to a problem even a little bit related to this helps i gain most of my knowledge buy talking/exchanging ideas from people who have years of experience. Quote Link to comment Share on other sites More sharing options...
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