>>Or even petrol jap car...

Almost 20,000 miles a year so I can see why you're considering diesel. Still, I'd be tempted to keep the Accord for a month or two just to see what real life mpg it gives you on your commute especially as it is mainly motorway. Then do the calculation on what you'll save by running at say 50mpg in a diesel and see if the savings are substantial enough to offset the risk of an expensive diesel failure. Or use the same maths to weigh up an lpg conversion or purchase.

Re the VW PD engines - the 150 bhp versions are less reliable than the lower bhp engines but the 130 bhp with engine code AWX is reckoned to be the best and will give you great economy and potentially good reliability. You'll have to shop around and look for one in good condition with a proper full service history as they need to have had a specific high spec oil all their life. There are many threads on this if you do a search.

Mazda 323F 1.5l which are very reiiable cars should do 44mpg which costs £54 a week (petrol @1.32) so a total of £3808 for a year if the car costs £1000.

So surely the more reliable jap car works out cheaper and would be a lot more reliable.

I drive the above car on the odd occasions on motorways but find it under powered and noisy at motorway speeds and the best mpg I have recorded on the motorway is 40mpg, average 37 mpg.

Have also driven a PD VW and on motorways this will average 58mpg but have seen as high as 65mpg, and it is a lot more relaxing to drive.