[hxgaser]

I have a 2001 HX. It has a 117 hp D17A6 VTEC motor. EX is rated at 127 hp and dx and lx's are rated at 105 or something like that. Also they are not VTEC. Anyways, I have been keeping track of the mileage and there are some variations. First, I have to let you know I recently put on a roof rack. Civic relies heavily on aerodynamics. With the rack on, it took off about 3 to 4 miles off the mileage. Before roof rack, I was averaging about 36 mph combined. I usually drive 80 to 85, on the freeway, but try to minimize on excessive acceleration. ie. floor the gas from 55 to 80 transition. With the roof rack on I am consistantly getting about 32 mpg city and highway combined. And if I take it off, I go back to 36 mpg.

Here is a little trick. HX lean burn VTEC kicks is about 2500 to 2800 rpm. So if you keep it below that limit, which is conveniently about 60 mph or so, you will get the advertised mileage. Without the roof rack, once I got 49 mpg, just cruzing at 58 mph on two lane highway. In anycase, you should be able to get 35 mpg combined even if you drive fast on the freeway, stock configuration.

Yeah I know it does not sound whole lot comparing to 26 mpg, but each 100 mile drive is 3 gallons vs. 4 gallons for your Z28. That is 25 percent saving.