Accord 05 VP Poor Gas Mileage

All sorts as the other chap said, but much can be eliminated by regular oil
changes and Italian tuning sessions.

 

Do you use cruise control and stick to a constant speed? Some cars are just
plain inefficient when asked to change speeds, for reasons various.

Hmm. Your tyre pressures were well low. This makes a big difference to
some cars. Our previous car was especially thirsty with the rear tyres low.
After extensive experimentation I ran him with slightly above standard
pressure at the front, and 5 PSI above at the back - it balanced out the
handling and improved (reduced) long haul fuel consumption to the tune of
around ten percent.

Heh. When new, it's tight. Your donk (engine) won't be working at its best
for "many" thousand miles. If you don't stretch its legs (find the red line
when properly warmed up, work it hard up hills) from time to time it may
well not be run in for a good sixty thousand miles.

It varies according to use - the initial 500 miles miles may well be
critical, after that, many handbooks recommend "gradually increasing
performance of the vehicle up to the maximum permitted" or similar wording.

Ding! Slow acceleration does not always compute to lower fuel consumption.
It will vary by car, environment, road (etc.) but moderate acceleration
tends to get the best results. Hard, red line acceleration just uses lots
of fuel. Too gentle acceleration prolongs it over a longer distance, so
there's less time cruising. Gentle or timid acceleration with a short
cruising period is thirstier than moderate acceleration, your engine will be
spending lots of time working relatively hard and a short period of time
cruising.

Also, where possible, lift off a big distance from your exit.

What were t'other cars and how does your mileage compare?

Elsewhere, yeah, we've established this as a major cause.