Just curious...post make/year/mileage and what you've done as far as engine modifications. We haven't done a thread like this in awhile.

1998 Accord Coupe LX-V6 (87 octane) with 215,800 mostly highway miles
- AEM SRI, otherwise engine is all stock
- Mobil1 5W-30 synthetic changes every 7-8k miles
Replaced Recently: Catalytic converter, seafoam/plugs/wires, cleaned EGR ports, just replaced EGR valve (haven't done a highway trip with it yet), fuel injector cleaner, cleaned air filter

Before I did all above I was getting 23.5ish 70% hway/30% city and 26 or so 100% highway. Now I'm getting 25MPG mixed and 27MPG highway. Hopefully the EGR valve brings that up a little bit.