I have a 01 F350 7.3 dually 2wd. I was getting 13 to 14 pulling my trailer now I get 8. Had the injectors checked and was told there are bad. So I replaced the injectors with swamps .025 over size injectors. My mileage is still the same! I've had a couple diesel mechanics look at and can't find anything wrong. They suggest its the over size injectors! I've called a couple of the performance web sites and they don't think it's the injectors. I have no codes,
I have a after market air filter system. Anybody else have any issues like this or any ideas? Thanks.