The site is reporting my 98 GMC K1500 4wd pickup with a 5.7 liter V8 and auto trans as being EPA rated as 13 city 17 hwy15 combined. The EPA's website reports my vehicle gets 12 city 16 hwy 13 combined. How can I correct this information?
This is an issue with old vs. new EPA numbers. The EPA recently revised their mileage estimates for all cars, but haven't yet made those new numbers available in a format that sites like Fuelly can use. Here's the difference in numbers reported by the EPA for your model: 1998 GMC Sierra 1500 4WD.
You can see that Fuelly has the old numbers. Until the EPA makes the new numbers available for download, we're stuck. We could update a model here or there by hand, but setting the new numbers across thousands of models/trim levels over dozens of years isn't possible by hand.
I knew they were revised, I just wasn't sure if the old estimates or was it giving me EPA data for a newer model. I did try to look and see if there was a similar question asked, but I'm used to how vBulletin forums work, and I'm not really familiar with how this forum organizes the posts.