Hello all, my name is Bryan and I'm new to this forum. I have a 98 regal GS and I think I'm having mpg issues. When I reset my mpg on the dic it says 28.5 hwy and 15-16 city which seems right however when I look to see how many miles I've gone when I put gas in, it's always not alot. I fill up at 1/4 tank usually and go 225 miles with the majority of miles as highway. The mpg looks right but the miles to tank so to speak doesn't. I've talked to people clearing 300 or more to a quarter tank.
My long term fuel trims are 3-5 highway cruising. City they are a little elevated to 7-9. Sitting at 10 at idle. When I go wot I hit 11.7. So I'm leaning out at wot and I'm lean around town. Now my fuel pressure is sitting around 41 psi at idle which is kind of low. Could that be why I'm leaning out under heavy acceleration? I'm kind of stumped at this point. If anyone can shed some light that'd be awesome. Any questions let me know, thank you in advance!