My 99 HX MT gets me 280 to 300 miles at the half tank mark! That's at 90% hwy driving at 65 mph No A/C.

I usually get 42.5 mpg tanks...

 

i have an '00 ex AT. i usually gas up around 250 miles and have gotten normally around 25 mpg this winter. when the weather was nice i was getting around 29-31. i got my car about a yr ago and ive never gotten more than 32. i also drive about 70% city roads

 

Different engine. I use premium nothing else.

 

Si = Premium.. nothing else goes in that tank.

 

All this is anecdotal evidence. Let's see some logfiles here guys.............

One tank does not an average make...

 

I get about the same but its a 99 prelude.Almost the same year, both dohc vtec engines that take premium. Probably get a little less mpg then you though. Highest was 25 but during winter it was like 20. Mostly city driving with some highway but highway going 70-75 mph rpm hovers around 3500-4000. Pretty high for just crusing.

 

Lol actually just started doing this. That was my first week. ill try to make a log soon

 

My 2000 Prelude SH 5spd. gets about 28MPG hwy and 23MPG city, 280-350mi per tankwith Shell or Amoco Ultimate 93octane
My 2000 Civic EX AT gets 31-34MPG hwy and 26-28MPG city, 320-380mi per tank withShell or Amoco 87octane

 

With my 99 si, i have gotten unto 320 miles to a tank. Then again, I am unsure if my low fuel light works, so I may be pushing the limits a little.

 

The Si will get poorer gas mileage because it's got more horsepower and people tend to over-rev their engines in these cars. The type of tires you have on your car will affect gas mileage too, esp. if they are the extra "sticky" ones and how much roll-resistance they have. Tire pressure will also affect gas mileage too.

Having said that, I currently own a 97 Civic Ex Coupe that gets about 36 mpg, with 95% of those miles on the highway, riding on Michelin Pilot Exalto (traction A rated) tires. I had a 94 Civic Ex Coupe prior to this which only got 26 mpg.